How to check if a string contains a substring in PHP

This article will introduce you to the method of checking whether a string contains substrings in PHP. For example, a specific line of code can only be run if any input string contains another substring, as we'll see below.

Let’s look at a specific example

Example 1:

The value of the following code will be true, Because the main string $str contains the substring "this". This will output "true".

<?How to check if a string contains a substring in PHP
$str = &#39;This is Main String&#39;;
 
if (strpos($str, &#39;This&#39;) !== false) {
    echo &#39;true&#39;;
}
?>

Example 2:

The value of the following code will be false because the main string $str does not contain the substring "hello". There will be no output.

<?How to check if a string contains a substring in PHP
$str = &#39;This is Main String&#39;;
$substr = "Hello";
 
if (strpos($str, $substr) !== false) {
    echo &#39;true&#39;;
}
?>

Example 3: String contains substring at the beginning

The following code will check whether the string is concatenated with the substring at the beginning. The value of the following code will be true because the main string $str contains the substring "this" at the beginning.

<?How to check if a string contains a substring in PHP
$str = &#39;This is Main String&#39;;
 
if (strpos($str, &#39;This&#39;) === 0 ) {
    echo &#39;true&#39;;
}
?>

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