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php functions

Replace Everything Inside Two Strings

December 27, 2018 mike PHP

Using the built in PHP regex function preg_replace and property encoding the two strings you’re searching for with preg_quote you can remove all of the

Strip Image EXIF Data

December 24, 2018 mike PHP

Many times you’ll want to remove the meta data on user uploaded images to your website. The meta data automatically saved to the images can

Function To Remove All Cookies For The Domain

December 6, 2018 mike PHP

This PHP function will delete all valid cookies for a domain. We’re also sanitizing the cookie variable names from invalid characters.

How to do Email Validation

December 4, 2018 mike PHP

Using the PHP filter_var function we can test email addresses for valid format and only unicode characters. Example usage below.

Replace All Characters In a String that Aren’t Alphanumeric

November 30, 2018 mike PHP

Using the preg_replace function you can easily replace all characters in a string that are not alphanumeric. This can be useful for sanitizing a string

How To Check the SHA Hash of Files

December 14, 2017 mike PHP

When you download software online often the publisher will also provide a file hash to make sure that the file hasn’t been modified or hacked

htmlentities() versus htmlspecialchars() – What’s Better For Emitting HTML?

November 18, 2017 mike PHP

Both htmlentities and htmlspecialchars work the same way in that they are used to emit a string of user input that may contain raw HTML

html diff

How to Diff Two Strings and Show the Difference in HTML

December 14, 2016 mike PHP

This php class will take two strings and return a html diff of them with the <ins> and <del> html tags representing what was deleted

How to Test a Date for Validity

December 13, 2016 mike PHP

Needed a function to test if a date was valid in PHP. This function does that but it also requires an expected date format. Example

Function to Remove Dollar Signs and Commas From a Number

December 8, 2016 mike PHP

I needed a function to turn a string value dollar with commas into a decimal I could insert into MySQL. This function below will take

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