How to check if a String Contains a Substring in PHP ?

A string is a collection of given characters and a substring is a string present in a given string.

In this article, we are going to check if the given string contains a substring by using the PHP strpos() function.

Syntax:

strpos($original_string,$sub_string);

Parameters:

• original_string : The input string
• sub_string : The substring searched in the original input string.

Return type: Boolean value

• True, If substring found
• False, If substring not found.

Example:

PHP

<?php
//input string
$input_string = "sravan kumar author at geeks for geeks ";

//sub string to be checked
$sub = "geeks";

// Test if string contains the word
if (strpos($input_string, $sub) !== false)
{
    echo "True";
}
else
{
    echo "False";
}
?>

Output:

True

Example 2:

PHP

<?php
//input string
$input_string = "sravan kumar author at geeks for geeks ";

//sub string to be checked
$sub = "computer";

// Test if string contains the word
if (strpos($input_string, $sub) !== false)
{
    echo "True";
}
else
{
    echo "False";
}
?>

Output:

False

Example 3: The following example also considers space.

PHP

<?php
//input string
$input_string = "geeks for geeks java python php";

//sub string to be checked
$sub = " ";

// Test if string contains the word
if (strpos($input_string, $sub) !== false)
{
    echo "True";
}
else
{
    echo "False";
}
?>

Output:

True

Example 4:

PHP

<?php
//input string
$input_string = "geeks for geeks java python php";

//sub string to be checked
$sub = " dbms";

// Test if string contains the word
if (strpos($input_string, $sub) !== false)
{
    echo "True";
}
else
{
    echo "False";
}
?>

Output:

False