04 May 2017

How to Check If String Contains a Substring in PHP

Written by Rahul K.

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”.

<?php
$str = 'This is Main String';

if (strpos($str, 'This') !== false) {
    echo 'true';
}
?>

<?php

$str = 'This is Main String';

if (strpos($str, 'This') !== false) {

echo '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.

<?php
$str = 'This is Main String';
$substr = "Hello";

if (strpos($str, $substr) !== false) {
    echo 'true';
}
?>

<?php

$str = 'This is Main String';

$substr = "Hello";

if (strpos($str, $substr) !== false) {

echo 'true';

}

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.

<?php
$str = 'This is Main String';

if (strpos($str, 'This') == 0 ) {
    echo 'true';
}
?>

<?php

$str = 'This is Main String';

if (strpos($str, 'This') == 0 ) {

echo 'true';

}

Example 1:

Example 2:

Example 3: String Contains Substring on Start

Rahul K.

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