How to find whether a variable is positive integer with PHP
PHP is_numeric() is useful to find whether a variable is a number or a numeric string. How you can check if a variable is an integer? You may use the…
Massive Change of File Permissions
Use the powerful find command with exec parameter to change permissions using chmod. To change permissions to 644 for all files in /path/to, use the following command: find /path/to -type…
Passing Array Variables using POST or GET with PHP
A convenient way to pass a single or multidimensional (possible utf-8) array is to serialize it ("convert it to a string") and pass it using a hidden input. After post…
Preventing JS or CSS Caching on Web Applications
It is very important for dynamic web applications, any js and css changes to become available to user (without need to refresh - reload browser page). Instead of <script type="text/javascript"…
Find all occurrences of a substring in a string with PHP
PHP stripos (or mb-stripos) finds the position of the first occurrence of a (case-insensitive) substring in a string. How to find all occurrences? Here is a solution: <?php /** *…
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