A fresh mix of code snippets and tutorials

Category Archive: PHP

Posts about PHP

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PHP fix exif_imagetype() error

Working on my plugin USP Pro, it’s become apparent to me that some servers for whatever reason disable the function exif_imagetype() function. So some users would get an error when trying to upload images. To resolve this, I added the following simple function to the plugin core.

PHP output buffering example

PHP’s ob_start() and ob_get_clean() are useful for buffering output of printed content and so forth, but I use them very rarely and tend to forget their order/syntax. So this post provides a quick copy/paste example that I can grab the next time I need to output buffer something.

PHP Get Memory Usage vs. Total

Here is a useful function that I modified for my WordPress plugin, Dashboard Widgets Suite. It returns an array containing the current memory usage and the total memory usage, so you can get and display a ratio of the values as needed.

PHP Get Server Information

Here are some scrap PHP scripts leftover from my work on Dashboard Widgets Suite. These functions were considered specifically for use with the System Information Widget, and provide a variety of details about the current server configuration and software setup.

PHP check if file exists by URL

This quick PHP snippet can be used to check if a specific URL exists. I use this in one of my projects for checking the existence of a robots.txt file on the site. Can be modified to check for files on any publicly accessible site.

Cron Notes: Ping External URL with No Output

Working on setting up Cron on ASO server for testing purposes.. just want to ping a URL/file, not save or send any output whatsoever. Here are my notes for future reference.

PHP Sanitize XSS

Here is a simple PHP function I use to prevent XSS attacks. Use it to sanitize any user-input or otherwise unknown variables before use.

PHP Add and Remove Query String Variables

Two quick functions, one for adding a query string variable and another to remove a query string variable. Either of these functions can be used in any PHP script to modify query-string parameters.

PHP Shorten String by Character Count

Quick copy-n-paste function to truncate or shorten a string of text to a specific number of characters. Useful for things like “next” and “previous” navigation links and so forth.

PHP Check if Request is HTTPS

Here we have a simple and effective PHP function that checks whether or not HTTPS (via SSL) is used for the current request.

PHP foreach loop

I am always using this PHP code snippet, which basically loops through an array that may or may not include nested arrays. So to make things easier, I am posting here for quick reference.

PHP Sanitize Form Data

On the Web, Cross-Site Scripting (XSS) is one of the most common types of attacks. Fortunately, there is an easy fix: always filter input data and always escape output data.