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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";
}
?>
[/GFGTABS]

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

Using substr_count function

The substr_count function in PHP efficiently counts the occurrences of a substring within a string. It returns the total count of occurrences, allowing for simple checks of substring presence or frequency within the given string.

Example:

PHP 
<?php
$string = "Hello World";
$substring = "World";

$count = substr_count($string, $substring);

if ($count > 0) {
    echo "Substring found";
} else {
    echo "Substring not found";
}
?>

Output
Substring found

Using preg_match Function

The preg_match function in PHP is used to perform a regular expression match. It returns the number of times the pattern matches (which will be 1 if it matches and 0 if it doesn’t).

Example:

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

//pattern to be checked
$pattern = "/geeks/";

// Test if string contains the pattern
if (preg_match($pattern, $input_string)) {
    echo "True";
} else {
    echo "False";
}
?>

Output
True







Reffered: https://www.geeksforgeeks.org

PHP

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Type:
 Geek
Category:
 Coding
Sub Category:
 Tutorial
Uploaded by:
 Admin
Views:
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