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

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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 zambiatek for zambiatek "; 
  
//sub string to be checked 
$sub = "zambiatek"; 
  
// 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 zambiatek for zambiatek "; 
  
//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 = "zambiatek for zambiatek 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 = "zambiatek for zambiatek 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"; 
} 
?> 