Inhouse Slideshow AlmaLinux Tutorial
Today we wanted to add so much more to our blog posting title. But, then, we also didn’t want to give the game away?! What a dilemma.
That blog posting title mentions …
- AlmaLinux … as RJM Programming’s Apache/PHP/MySql web server “brand”, using …
- PHP 8 … as distinct from the PHP 5’s of the CentOS web server days … and so we suppose we should expect issues like the dreaded …
- Deprecation … of …
- Zip … functionality … so sad seeing the early symptoms of this with …
- Inhouse Slideshow presentations … (as last talked about with Inhouse Slideshow Backup Tidy Up Crontab Curl PHP Tutorial) deprecation warnings
Surprising to us, trying to logically walk though a solution, currently up at our AlmaLinux web server here the PHP …
function_exists
… approach we have used successfully recently did not work here. Anyway, deprecated or non-existant it doesn’t matter, we decided to resort to good ol’ PHP exec methodologies in a new “inhouse slideshow” (featuring in a changed example PHP inhouse slideshow creator web application) call …
<?php
include($_SERVER['DOCUMENT_ROOT'] . "/ziphelper.php");
?>
… containing …
<?php
// ziphelper.php
// RJM Programming
// February, 2025
$gzip_read_output=null;
$gzip_open_handle=null;
$gzip_entry_filename='';
$gzip_filename='';
$gzip_entry_len=0;
$gzip_number=0;
$gzip_log_text='';
if (strpos($_SERVER['REQUEST_URI'], 'index.') !== false) {
$hereis='' . dirname(__FILE__) . explode("index.", $_SERVER['REQUEST_URI'])[0];
} else if (basename($_SERVER['SCRIPT_FILENAME']) != '') {
$hereis=explode(basename($_SERVER['SCRIPT_FILENAME']), realpath($_SERVER['SCRIPT_FILENAME']))[0];
} else {
$hereis='' . dirname(__FILE__) . str_replace('//','/',explode("?", $_SERVER['REQUEST_URI'])[0] . '/');
}
$zipisis='' . $hereis . 'slideshow_0.zip';
$alreadythere=false;
if (file_exists($zipisis)) {
$items = glob($hereis . "*[-_][0-9]*of.[jJgGpP][pPiInN]*");
foreach ($items as $key => $val) {
$alreadythere=true;
}
}
if (!function_exists("zip_entry_read")) {
function zip_entry_read($zip_read_output, $zip_entry_len) {
global $gzip_filename, $gzip_number, $gzip_log_text, $gzip_read_output, $gzip_entry_len;
return 'pork';
}
}
if (!function_exists("zip_entry_filesize")) {
function zip_entry_filesize($zip_read_filename) {
global $gzip_filename, $gzip_number, $gzip_log_text, $gzip_entry_filename;
return 'pork';
}
}
if (!function_exists("zip_read")) {
function zip_read($zip_oben_handle) {
global $gzip_filename, $gzip_number, $gzip_log_text, $gzip_open_handle;
return 'pork';
}
}
if (!function_exists("zip_open")) {
function zip_open($zip_filename) {
global $gzip_filename, $gzip_number, $gzip_log_text, $gzip_filename;
$gzip_filename=$zip_filename;
$gzip_number=0;
$gzip_open_handle='pork';
return 'pork';
}
}
if (!function_exists("zip_entry_name")) {
function zip_entry_name($zip_read_output) {
global $gzip_filename, $gzip_number, $gzip_log_text, $gzip_read_output;
return 'pork';
}
}
if (!function_exists("zip_entry_open")) {
function zip_entry_open($zip_open_handle, $zip_read_output, $inmode) {
global $gzip_filename, $gzip_number, $gzip_log_text, $gzip_open_handle, $gzip_read_output;
return 'pork';
}
}
if (!function_exists("zip_close")) {
function zip_close($zip_open_handle) {
global $gzip_filename, $gzip_number, $gzip_log_text, $gzip_open_handle;
return 'pork';
}
}
if (file_exists($zipisis)) {
if (!$alreadythere) {
file_put_contents($hereis . 'please.wait', "cd " . $hereis . ' ; unzip ' . $zipisis);
sleep(2);
exec("cd " . $hereis . ' ; unzip ' . $zipisis);
sleep(2);
unlink($hereis . 'please.wait');
//exec("cd " . $hereis . ' ; rm -f please.wait');
//if (1 == 1) {
//header('Location: ' . explode('?',$_SERVER['REQUEST_URI'])[0] . '?rand=' . rand(0,674532));
//exit;
//} else {
//sleep(60);
//exec("cd " . $hereis . ' ; rm -f ' . $hereis . '*[-_][0-9]*of.[jJgGpP][pPiInN]*');
//}
//if (basename($_SERVER['SCRIPT_FILENAME']) == 'index.php') {
//sleep(60);
//exec("cd " . $hereis . ' ; rm -f ' . $hereis . '*[-_][0-9]*of.[jJgGpP][pPiInN]*');
//}
//sleep(9);
//echo '<html><body onload="location.href=' . "'" . explode("?", $_SERVER['REQUEST_URI'])[0] . '?rand=' . rand(0,5645342) . "';\"></body></html>";
//exit;
} //else if (basename($_SERVER['SCRIPT_FILENAME']) == 'index.php') {
//sleep(60);
//exec("cd " . $hereis . ' ; rm -f ' . $hereis . '*[-_][0-9]*of.[jJgGpP][pPiInN]*');
//}
}
?>
… as a first draft. We have much more to do trying to resurrect, if possible, some other inhouse PHP web applications we’ve based on the use of Zip in PHP. Pardon us, until tomorrow, while we have a little cry.
Previous relevant Inhouse Slideshow Backup Tidy Up Crontab Curl PHP Tutorial is shown below.
Inhouse Slideshow Backup Tidy Up Crontab Curl PHP Tutorial
Crontab is that great scheduling tool that we make use of, a lot, on our RJM Programming Linux CentOS web server. But it’s not only …
- the timing … of a procedure that is so good about crontab … it is, also, for us, it’s teaming with …
- curl
… that means we can back up a “peer based” solution such as talked about with Inhouse Slideshow Backup Tidy Up Report Viewing Tutorial (ie. done as a user is surfing the net with some PHP of ours) methodology should it fail. We think we have an occasionally failing one as far as the tidy up of zipped up inhouse slideshows goes. It could be to do with a search engine crawling operation, we have not found out for sure, but we’ve decided to write our own …
… based independent tidying up procedure we’ll run once an hour via crontab record …
*/53 * * * curl http://www.rjmprogramming.com.au/slideshow_zero.php
… arrangement. We realize the contents of this PHP procedure may bore some, but interest a few, and so here is what it amounted to …
<?php
// slideshow_zero.php
// Zip and Unzip Tidy Up
// RJM Programming
// Decemeber, 2022
set_time_limit(3600);
if (file_exists("slideshow_zero.txt")) {
unlink("slideshow_zero.txt");
}
if (file_exists("slideshow_zero.kkk")) {
unlink("slideshow_zero.kkk");
}
exec("find " . dirname(__FILE__) . DIRECTORY_SEPARATOR . " -name 'slideshow_0.zip' 2> /dev/null > " . dirname(__FILE__) . DIRECTORY_SEPARATOR . "slideshow_zero.txt");
$lines=file(dirname(__FILE__) . DIRECTORY_SEPARATOR . "slideshow_zero.txt");
$htmlis="<html><body><textarea>
</textarea></body></html>";
for ($i=0; $i<sizeof($lines); $i++) {
$lines[$i]=explode("\n", $lines[$i])[0];
if (file_exists(str_replace("slideshow_0.zip", "index.php", $lines[$i]))) {
if (('' . filesize(str_replace("slideshow_0.zip", "index.php", $lines[$i]))) == '38794') {
if (file_exists("slideshow_zero.txx")) {
unlink("slideshow_zero.txx");
}
exec("unzip -l " . $lines[$i] . " | grep '.jpg' | sed '/^ /s///g' | sed '/^ /s///g' | sed '/^ /s///g' | sed '/^ /s///g' | sed '/^ /s///g' | sed '/ /s// /g' | sed '/ /s// /g' | sed '/ /s// /g' | sed '/ /s// /g' | cut -f4 -d' ' | grep '-' > " . dirname(__FILE__) . DIRECTORY_SEPARATOR . "slideshow_zero.txx");
if (file_exists("slideshow_zero.txx")) {
$sublines=file(dirname(__FILE__) . DIRECTORY_SEPARATOR . "slideshow_zero.txx");
for ($j=0; $j<sizeof($sublines); $j++) {
$sublines[$j]=explode(" ", explode("\n", $sublines[$j])[0])[0];
$fis=explode("slideshow_0.zip", $lines[$i])[0] . $sublines[$j];
if (file_exists($fis)) {
$md=filemtime($fis);
if ($md) {
if ((time() - $md) > 1200) {
if (file_exists("slideshow_zero.kkk")) {
exec("rm -f " . $fis); //file_put_contents("slideshow_zero.kkk", file_get_contents("slideshow_zero.kkk") . "rm -f " . $fis . "\n");
} else {
exec("rm -f " . $fis); //file_put_contents("slideshow_zero.kkk", "rm -f " . $fis . "\n");
}
}
}
}
}
}
} else if (1 == 3) {
if (file_exists("slideshow_zero.kkk")) {
file_put_contents("slideshow_zero.kkk", file_get_contents("slideshow_zero.kkk") . "# " . ('' . filesize(str_replace("slideshow_0.zip", "index.php", $lines[$i]))) . " is not 38794 " . str_replace("slideshow_0.zip", "index.php", $lines[$i]) . "\n");
} else {
file_put_contents("slideshow_zero.kkk", "# " . ('' . filesize(str_replace("slideshow_0.zip", "index.php", $lines[$i]))) . " is not 38794 " . str_replace("slideshow_0.zip", "index.php", $lines[$i]) . "\n");
}
}
}
}
if (file_exists("slideshow_zero.txx")) {
unlink("slideshow_zero.txx");
}
if (file_exists("slideshow_zero.txt")) {
unlink("slideshow_zero.txt");
}
if (file_exists("slideshow_zero.kkk")) {
unlink("slideshow_zero.kkk");
}
//echo $htmlis;
exit;
?>
… as that “ahhhhhhhh, what a relief” reliever of tension running the RJM Programming website. The subtext is, our inode limits are a concern!
We think another lesson here is that PHP can be a good alternative to scripting languages such as Korn Shell to create “operational” procedures, especially when you consider that curl means it can be like writing your “surfing the net” type of PHP (slideshow_zero.php) work.
Previous relevant Inhouse Slideshow Backup Tidy Up Report Viewing Tutorial is shown below.
Inhouse Slideshow Backup Tidy Up Report Viewing Tutorial
The thing about yesterday’s Inhouse Slideshow Backup Tidy Up Report Tutorial is that …
- it creates useful report content … but …
- it is information we do not want everyone to be able to see (easily, shall we say) … and in the sense that …
- the report is stored away from RJM Programming’s “public_html” folder (ie. its Apache/PHP/MySql “Document Root”) is good … but even with today’s work …
- hidden from everybody who does not have access to the RJM Programming’s web server … but …
- the administrator of the RJM Programming’s web server (yoo hoo!) wants a mechanism to view the report that does not involve some “arcane procedure” each time to view it
… and so we decided that because …
the administrator of the RJM Programming's web server = the administrator of this blog
… we’d like to organize a system that latches onto that “security footing” and only show a “broom emoji button” (🧹 🧹) way to access the report when the administrator of this blog is logged in. We can do this by amending our Twenty Ten theme’s good ol’ header.php as per (where the “function mlater” you may recall from the days of WordPress Blog Email Post Collaboration Ajax Image Tutorial) …
<?php
$fns="36";
function doisr() {
global $fns;
$inmb="";
if (('' . get_current_user_id()) != '0' && ('' . get_current_user_id()) == '1') {
if (file_exists('/tmp/slideshow_cleanup.txt')) {
$fns="24";
$inmb="<a style=font-size:24px; title='Inhouse Slideshow Tidy Up Report' onclick=\"var iswo=window.open('','_blank','top=100,left=100,height=600,width=730'); iswo.document.write('<html><head><title>Inhouse Slideshow Tidy Up Report</title></head><body><pre>" . str_replace("\n","<br>",file_get_contents('/tmp/slideshow_cleanup.txt')) . "</pre></body></html>'); \">🧹</a> ";
}
}
return str_replace("'","' + String.fromCharCode(39) + '",$inmb);
}
?>
… PHP affects some (PHP writes) Javascript below …
<?php
function mlater() {
if (1 == 1 || navigator.userAgent.match(/Android|BlackBerry|iPhone|iPod|Opera Mini|IEMobile/i)) {
if (dbihis == '') { dbihis=document.body.innerHTML; }
var xstih=document.getElementById('site-title').innerHTML;
if (xstih.indexOf("up" + "top") == -1) {
document.getElementById('site-title').innerHTML+='<?php echo doisr(); ?>' + '<a id="avs" style="text-decoration:none;font-size:<?php global $fns; echo $fns; ?>px;" href=# onmouseover="getVisualSynopsis(event);" onmouseout="yehbut();" ontouchstart="getVisualSynopsis(event);" ontouchend="yehbut();" onclick=" uptop(); " title="... you can wait for the long hover functionality about Visual Synopsis (Slideshows)">🎦</a> <a style="cursor:pointer;text-decoration:none;font-size:<?php global $fns; echo $fns; ?>px;" onclick="diffphpfix(this);" title="Code Difference Functional Links">📖</a> <a style="cursor:pointer;text-decoration:none;font-size:36px;" onclick="popselid();" title="Filter Content via Div ID">➗</a> <a style="cursor:pointer;text-decoration:none;visibility:hidden;font-size:<?php global $fns; echo $fns; ?>px;" title="Blog post contents reduced to summary" id="eds" onclick="pre_details_summary();">➖</a>' + printscreen(0);
if (document.URL.indexOf("visualsynopsis=") != -1) document.getElementById('avs').click();
}
}
}
?>
Previous relevant Inhouse Slideshow Backup Tidy Up Report Tutorial is shown below.
Inhouse Slideshow Backup Tidy Up Report Tutorial
Yesterday’s Inhouse Slideshow Backup Tidy Up Tutorial presented a …
- non-automated
- user instigated
- snapshot
… Inhouse Slideshow “tidying up” PHP web application. This web application is like a …
- procedure … that a …
- system operator
… might be interested in using. But not many “system operators” would continue putting up with such a modus operandi. We can improve by …
… with our changed slideshow_cleanup.php “Inhouse Slideshow” unzipped image “tidyer upperer“.
Previous relevant Inhouse Slideshow Backup Tidy Up Tutorial is shown below.
Inhouse Slideshow Backup Tidy Up Tutorial
There are two aspects to diskspace maintainence up at the web server for RJM Programming.
|
|
# diskspace
# inode count
|
… and it is often that inode count we are concerned about, and looking out for ways to reduce the number of files we create on the web server.
The Inhouse Slideshow ways of Inhouse Slideshow Mobile Google Crawl Tutorial …
- use zip files to “scrunch up” a series of image files into the one zip file … for the vast majority of time … but when asked to, by a user …
- unzip the image files when required by a user wanting to see them … and then …
- tidy up, after some delay in time
… but we want to design a PHP way to independently tidy up as a backup mechanism. And we say, with PHP code, that if such files have been on the web server longer than ten minutes, this PHP callable slideshow_cleanup.php code …
<?php
// slideshow_cleanup.php
// RJM Programming
// May, 2022
$cdis=dirname(__FILE__) . DIRECTORY_SEPARATOR;
exec("cd " . $cdis . "; find . -name 'slideshow_0.zip' 2> /dev/null > /tmp/slideshow_cleanup.txt");
$lines = file('/tmp/slideshow_cleanup.txt');
date_default_timezone_set('Australia/Perth');
foreach ($lines as $line_num => $line) {
$ji=0;
if (substr($line,0,1) == '.') { $ji=2; }
$thisdir=explode('slideshow_0.zip', $line)[0];
$uzc=shell_exec("unzip -l " . $cdis . substr($line, $ji));
foreach (glob($thisdir . '*-[0-9]*of.[jJpPgG][pPnNiI]*') as $zipmember) {
$ij=0;
if (substr($zipmember,0,1) == '.') { $ij=2; }
$thisfile=$cdis . substr($zipmember, $ij);
if (strpos($uzc, (' ' . explode(DIRECTORY_SEPARATOR, substr($zipmember, $ij))[-1 + sizeof(explode(DIRECTORY_SEPARATOR, substr($zipmember, $ij)))]) ) !== false) {
if ((time() - filectime($thisfile)) > 600) { // more than 10 minutes old
unlink($thisfile); //echo "analyze " . $thisfile . " " . (time() - filectime($thisfile)) . ' seconds ago ' . "\n";
}
}
}
foreach (glob($thisdir . '*-[0-9]{[0-9]*}.[jJpPgG][pPnNiI]*') as $zipmember) {
$ij=0;
if (substr($zipmember,0,1) == '.') { $ij=2; }
$thisfile=$cdis . substr($zipmember, $ij);
if (strpos($uzc, (' ' . explode(DIRECTORY_SEPARATOR, substr($zipmember, $ij))[-1 + sizeof(explode(DIRECTORY_SEPARATOR, substr($zipmember, $ij)))]) ) !== false) {
if ((time() - filectime($thisfile)) > 600) {
unlink($thisfile); //echo "Analyze " . $thisfile . " " . (time() - filectime($thisfile)) . ' seconds ago ' . "\n";
}
}
}
}
?>
… should do its thaing!
Previous relevant Inhouse Slideshow Mobile Google Crawl Tutorial is shown below.
Inhouse Slideshow Mobile Google Crawl Tutorial
The recent Inhouse Slideshow Mobile Tutorial did not satisfy all the “mobile usability” tests performed by the “Google Crawl” algorithm, failing on “Content wider than screen”, and you can read some background to this with Google Crawl Viewport Geographicals Tutorial. And so we try some refinements here today, with an idea to control on mobile platforms the max-width CSS property of the document.body of a Inhouse Slideshow webpage, which made up the URLs failing this test at the Google Search Console.
We were reading this great and useful link, thanks, and decided to see whether this stopping of scrolling in X on mobile platform versions of the Inhouse Slideshow webpages gels better with Google Search Console “Google Crawl” Mobility Usability algorithms.
Yet again, deployment of these changes is similar to that last time, and the times before that, as per …
Unit testing completed, the deployment, again, matches those ideas of the recent PDF Slideshow and Form Creation Helper Slideshow Tutorial … in that …
Here are changes we’ll be testing up at Google …
<head>
<script type='text/javascript'>
// Other Javascript code here ...
//
//
// Of relevance today bold below ...
function blater() {
var tdsare=document.getElementsByTagName('td');
var rectg=tdsare[2].getBoundingClientRect(); //document.getElementById('i0').getBoundingClientRect();
tdsare[2].style.borderRight='2px solid white';
document.body.style.backgroundImage="URL('" + document.getElementById('i0').src + "')";
var rl=eval('' + rectg.left);
rl+=eval('' + rectg.width);
rl+=10;
document.body.style.backgroundPosition=" " + rl + "px " + Math.floor(rectg.top) + "px";
document.body.style.backgroundRepeat="no-repeat";
document.body.style.backgroundClip="content-box";
}
function zoom_maybe() {
if (navigator.userAgent.match(/Android|BlackBerry|iPhone|iPad|iPod|Opera Mini|IEMobile/i)) {
//document.getElementById('rfs').innerHTML='<style> html { zoom: .5; } </style>';
document.getElementById('rfs').innerHTML='<style> html { zoom: 0.4; body { max-width: 100%; max-height: 80vh; } table { max-width: <?php if (strpos($_SERVER['QUERY_STRING'],'exif=') !== false) { echo "100"; } else { echo "95"; } ?>%; max-height: 80vh; margin: auto; overflow-x: hidden; } </style>';
}
}
function nwpdf(iithis) {
if (('' + iithis.src).length > 0) {
if (navigator.userAgent.match(/iPhone|iPad|iPod/i)) {
window.open(iithis.src,'_blank');
}
}
}
function mytw() {
if (navigator.userAgent.match(/Android|BlackBerry|iPhone|iPad|iPod|Opera Mini|IEMobile/i)) {
document.body.style.width='' + (window.orientation == 0 ? Math.floor(eval(2.5 * window.screen.width)) : window.screen.height) + 'px';
document.getElementById('myt').style.width='100%'; //'' + (window.orientation == 0 ? window.screen.width : window.screen.height) + 'px';
}
}
window.setInterval(function(){havealook(1)},2000);
</script>
<style>
td { vertical-align:top; }
@media only screen and (max-width: 800px) {
body { max-width: 100%; max-height: 80vh; } table { max-width: <?php if (strpos($_SERVER['QUERY_STRING'],'exif=') !== false) { echo "100"; } else { echo "95"; } ?>%; max-height: 80vh; margin: auto; overflow-x: hidden; }
}
</style>
</head>
<body onload=" mytw(); zoom_maybe(); if (document.URL.indexOf('pdf=') != -1) { document.getElementById('selmode').value='PDF Slideshow'; if (document.getElementById('tdfirst')) { document.getElementById('s0').style.width=document.getElementById('tdfirst').style.width; document.getElementById('s0').style.height=document.getElementById('tdfirst').style.height; } } if (document.URL.indexOf('exif=') != -1) { document.getElementById('selmode').value='Exif Slideshow'; if (document.getElementById('tdfirst')) { document.getElementById('s0').style.width=document.getElementById('tdfirst').style.width; document.getElementById('s0').style.height=document.getElementById('tdfirst').style.height; } } document.title=document.title + ' ' + lastone; ol(); ">
Previous relevant Inhouse Slideshow Mobile Tutorial is shown below.
Inhouse Slideshow Mobile Tutorial
The recent PDF Slideshow and Form Creation Helper Slideshow Tutorial changes were made on a MacBook Pro laptop. Did it show that we have put off until today, to look at that functionality with mobile platforms?!
In a “going off to the right table row of cells” arrangement like this, what are some considerations that improve the user experience (of our inhouse slideshows) for mobile platform users?
- turn the “@” link into an “emoji button” as per ➡ ( ➡ )
- for both mobile and non-mobile, we’ve decided …
- UTF-8 meta …
<meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″>
-
<style>
td { vertical-align:top; }
</style>
- change the h4 element to be h2 to help with legibility
- for mobile, we’ve decided …
- viewport …
<meta name=”viewport” content=”width=device-width, initial-scale=0.4, minimum-scale=0.1, maximum-scale=8, user-scalable=yes”>
-
<style>
html { zoom: .5; }
</style>
- iOS (ie. iPad and iPhone) PDF iframe elements have known scrolling issues, which we decided to bypass by opening these PDF creations in a new webpage window
Deployment of these changes is similar to that last time, and the times before that, as per …
Unit testing completed, the deployment, again, matches those ideas of the recent PDF Slideshow and Form Creation Helper Slideshow Tutorial … in that …
Previous relevant PDF Slideshow and Form Creation Helper Slideshow Tutorial is shown below.
PDF Slideshow and Form Creation Helper Slideshow Tutorial
The first “integration cab” off the rank for yesterday’s PDF Slideshow and Form Creation Helper Primer Tutorial underlying usefulness is with our Inhouse Slideshow arrangements last talked about at Inhouse Slideshow Design Exif Order Tutorial. That generic PHP code now has three display dropdown options of …
- Slideshow
- Exif Slideshow … and the new, as of today’s work …
- PDF Slideshow
… that little bit different in that a PDF Slideshow occupies just the one table cell (rather than the many horizontal cells of the other display modes) and the resultant embedded PDF data vertically scrolls when multiple image slides are involved.
This new option also adds onto this “Inhouse Slideshow” functionality the chance to download and keep a PDF representation of that slideshow to your local system. Perhaps this makes this be of interest to you?!
The changed form_creator.php‘s live run is what gets integrated into the “Inhouse Slideshow” “sisterhood”. We say “sisterhood” because this “Inhouse Slideshow” is designed as a single PHP codefile “hived off” to a lot of other web server folders as their default “index.php” web browser default webpage in a “peer to peer” feeling arrangement. Such an arrangement asks a bit of the deployment arrangements, and we’ve talked about this before (with underlying links pointing to today’s work, should you be interested) …
Unit testing completed, the deployment, again, matches those ideas of the recent Inhouse Slideshow Design Exif Zip Tutorial … in that …
But when we say “Unit testing completed” above, we need to fill you in on a Fpdf issue we came across during unit testing of our changes. We were getting a …
FPDF Error: Not a JPEG file
… Fpdf error message choosing the new “PDF Slideshow” option on some, but not all, “Inhouse Slideshow” address bar URLs. And so the online research began as per …
… almost getting us there to a solution (and as far as the last link goes “that was before we posted the suggestion below”). Then we took one of the error messages at its word …
FPDF error: Not a JPEG file: ../Mac/Linux_drutil-238of.jpg
… and independently looked into the issue via Linux (or macOS command line) file command …
# cd $HOME/public_html/Mac
# ls -l Linux_dr*
-rw-r--r-- 1 owner group 724353 Oct 29 08:00 Linux_drutil-238of.jpg
-rw-r--r-- 1 owner group 132707 Oct 29 08:00 Linux_drutil-239of.jpg
-rw-r--r-- 1 owner group 109595 Oct 29 08:00 Linux_drutil-240of.jpg
# file Linux_drutil-238of.jpg
Linux_drutil-238of.jpg: PNG image data, 1280 x 800, 8-bit/color RGBA, non-interlaced
# file Linux_drutil-239of.jpg
Linux_drutil-239of.jpg: JPEG image data, JFIF standard 1.01
#
… when the penny dropped (about our (macOS) Paintbrush slideshow slide creation habits)! We quote our entry into “php – FPDF error: Not a JPEG file: http://10.11.201.93:81/webdocc/uploaded/tes3.jpg – Stack Overflow” …
Have found that constructing slideshows with Paintbrush on a MacBook Pro for years have sometimes been saving what “file jpeg_filename.jpg” determines is a PNG, as a JPEG, which is not the end of the world as far as the browsers go rendering this. Within FPDF’s fpdf.php I fixed my own shortcomings that were resulting in “FPDF Error: Not a JPEG file” via the kludgy “if($a[2]==3) { return $this->_parsepng($file); }” additional codeline below …
function _parsejpg($file)
{
// Extract info from a JPEG file
$a = getimagesize($file);
if(!$a)
$this->Error(‘Missing or incorrect image file: ‘.$file);
if($a[2]==3) { return $this->_parsepng($file); }
if($a[2]!=2)
$this->Error(‘Not a JPEG file: ‘.’ ‘.$a[2].’ ‘.$file);
if(!isset($a[‘channels’]) || $a[‘channels’]==3)
$colspace = ‘DeviceRGB’;
elseif($a[‘channels’]==4)
$colspace = ‘DeviceCMYK’;
else
$colspace = ‘DeviceGray’;
$bpc = isset($a[‘bits’]) ? $a[‘bits’] : 8;
$data = file_get_contents($file);
return array(‘w’=>$a[0], ‘h’=>$a[1], ‘cs’=>$colspace, ‘bpc’=>$bpc, ‘f’=>’DCTDecode’, ‘data’=>$data);
}
… and this change to Fpdf’s fpdf.php fixed the issue in our case for a lot of our previously erroneous “PDF Slideshow” displays of “Inhouse Slideshows”.
Previous relevant PDF Slideshow and Form Creation Helper Primer Tutorial is shown below.
PDF Slideshow and Form Creation Helper Primer Tutorial
Our recent work involving the great Fpdf creator of PDF files when we presented Ajax FormData Object No Body PHP PDF Tutorial has got us starting on a new PDF (PHP) web application we are starting out thinking will help with …
- online forms (probably via thinking in terms of Fpdf open source programmers like Rick van Buuren and Clément Lavoillotte‘s excellent HTML table rendering ideas) via HTML table intermediate user interactions … and …
- slideshows
… but we will not be surprised if the project branches out into other ideas. We’ll see over time.
We hope you come along for the trip starting with a bit of a proof of concept form_creator.php‘s live run for you to try, where we allow you to enter (and be able to change) some HTML table code (if that’s what you end up with?!) in a pink HTML textarea element, and that will become PDF should you click the underlying HTML form’s yellow submit button.
Hope to see you for tomorrow’s PDF writing developments here.
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