Category Archives: php-mysql

How to fix Fatal error: Allowed memory size exhausted in WordPress 3

This error is nothing new, per se, as far as I know it was present also in previous versions of wordpress (I’m a fresh new user and I’ve been using v3+ for more than I’ve been with 2.9.7 (first one I installed).
When this error occurred in previous versions, all you needed to do was open the [WORDPRESS FOLDER] > wp-settings.php file, and change the maximum allowed allocable ram from there. And that’s what most guides still tell you to do now, leaving you stranded as that line you need to change is not there anymore.
What you see though, is that at the beginning of the wp-settings.php file there is a line that says:

require( ABSPATH . WPINC . '/default-constants.php' );

which pretty much says it all, unless you are not the least bit PHP savvy (hence, this guide is for you).
All you need to do is open the [WORDPRESS FOLDER] > wp-includes > default-constants.php file, and change the line:

define('WP_MEMORY_LIMIT', '32M');

into

define('WP_MEMORY_LIMIT', '40M');

or anything of your liking (may be 36M, 48M, or whatever depending on your setup); obviously, the lower the better for the performance of your server, especially if you’re on a shared hosting.

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Resize, enlarge or scale an html image map with a PHP script

I am creating a portal for an italian website which will sport a nice region selector with an imagemap, and region highlighting with a javascript. I found a free and detailed image map of italy along with a combined png, but it was too small to be really useable, so I needed to put a bigger image; with that, I also needed to alter the imagemap coordinates to they matched the enlarged image… noway I was going to do that by hand!

So, after searching for a pre-made solution (which I obviously didn’t find)  I devised a very simple PHP script to do eaxctly that. The script puts the entire code for the image map inside a string variable, and then processes that string with a regular expression search and replace to change the values accordingly to my needs. I only needed to make the image two times bigger, mantaining the aspect ratio, but since I was going to publish this inside a guide, I said to myself “why not making it so you can change the aspect ratio as well”. So, if you want, you can make the imagemap two times larger, and 1.5 times taller.

Here’s the sample script (the $html variable is defined with a sample imagemap for the region of Lazio alone, for space purposes, but you can put whatever you want inside, I used it with the whole map of Italy, together with <map> tags and lines breaks/indentation). Be careful and ESCAPE the double quotes inside the HTML before pasting the code inside the string. In other words, simply put a backslash (the \ character) before each occurence of a double quote (the $quot; character) inside the HTML, I used the search and replace function of Notepad++.

<?php
$html="<area href=\"#\" alt=\"state\" title=\"lazio\" shape=\"poly\" coords=\"74.513,86.938,75.667,87.365,75.667,88.007,74.744,89.077,75.436,90.467,76.359,90.039,77.857,90.039,78.319,90.039,79.127,90.788,79.588,91.857,79.588,92.606,80.049,93.034,80.51,93.034,81.317,94.103,81.779,94.852,82.24,94.959,83.74,94.852,84.201,94.959,85.123,94.959,86.392,94.103,87.43,93.141,88.122,93.141,89.39,93.141,89.967,92.713,91.351,90.895,91.813,90.895,92.274,91.216,93.196,90.895,94.349,90.788,94.926,90.467,96.31,89.825,96.886,90.467,96.656,90.895,95.849,91.323,95.387,92.072,94.234,92.072,92.965,92.713,92.505,93.676,92.505,94.317,92.734,94.959,91.928,95.28,91.813,95.922,91.467,96.778,92.505,98.382,92.505,99.023,92.505,99.986,91.928,101.804,91.928,103.194,92.734,103.837,94.234,103.623,96.31,104.264,97.579,105.013,99.309,106.51,102.191,108.543,103.229,108.543,104.728,109.077,106.113,110.361,106.574,111.965,106.804,113.035,106.574,113.783,106.574,114.425,105.882,114.853,105.305,115.067,104.844,115.067,104.728,116.029,104.728,117.099,104.152,118.061,103.46,118.703,102.999,119.345,102.999,120.093,101.961,120.308,100.23,120.735,99.539,120.308,98.271,119.345,96.656,118.489,95.156,118.275,92.965,118.489,91.005,118.703,89.39,116.885,89.506,116.029,88.122,114.639,85.931,113.997,83.97,112.607,81.548,110.574,78.55,107.687,77.627,105.869,76.128,104.692,74.975,102.874,73.706,101.056,71.745,99.023,70.131,97.098,67.594,94.959,69.093,93.676,70.131,92.606,70.592,91.216,70.592,90.039,71.745,89.611,72.553,88.649,73.014,88.221,72.553,86.938,73.245,86.189,74.513,86.938\" />";
echo preg_replace("/([0-9.]{2,}),([0-9.]{2,})/e","round(\\1*2,3).','.round(\\2*1.5,3)",htmlentities($html));
?>

All you need to do is change the parameters inside the regular expression (numbers in red), first is for horizontal proportion, second for vertical; in this example the imagemap will be resized to 2 times its length, and 1.5 times its height, if you want to make the size three times bigger, change it to

echo  preg_replace("/([0-9.]{2,}),([0-9.]{2,})/e","round(\\1*3,3).','.round(\\2*3,3)",htmlentities($html));

Then, copy the php script to your server, open it in a web browser, and copy/paste the result. Note: according the the way the imagemap is originally formatted, you may need to edit the regular expression to accomodate for spaces, tabs, linebreaks or whatever; in this case, since the coordinates were listed with just commas inbetween it was not needed. If you are stuck, write in the comments an excerpt of your imagemap code and I’ll try and help you.

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