How to Check If String Contains a Substring in PHP

This tutorial will help you to check if a string contains any substring in PHP programming language. For example, you want to run a specific line of code only if any input string contains another substring in it.

Example 1:

The following code will evaluate to true because the main string $str contains the substring ‘This‘ in it. This will print “true”.

Example 2:

The following code will evaluate to false because the main string $str doesn’t contains the substring ‘Hello‘ in it. This will nothing print.

Example 3: String Contains Substring on Start

The following code will check if a String conatins a substring at start. The following code will evaluate to true because the main string $str contains the substring ‘This‘ at start.