How to Check if a String Contains a Specific Word in PHP

  1. Defining the Strpos() Function
  2. Related Resources

This snippet will help you to check whether a string contains a specific word or not.

You can apply the strpos() function for checking if a string contains a certain word.

This function is capable of returning the position of the first occurrence of a substring inside a string. In the case of not detecting the substring, false is returned. But, the positions of the string begin from 0 and not 1. For a better perception of this function, check out the example below:

<?php

$word = 'fox';
$myString = 'The quick brown fox jumps over the lazy dog';
// Test whether the string contains the word
if (strpos($myString, $word) !== false) {
    echo "Word Found!";
} else {
    echo "Word Not Found!";
}

 ?>

There is a new function str_contains() in PHP 8 that provides the same functionality.

<?php

$word = 'fox';
$myString = 'The quick brown fox jumps over the lazy dog';

// Test whether the string contains the word
if (str_contains($myString, $word)) {
    echo 'Word Found!';
} else {
    echo 'Word Not Found!';
}

Defining the Strpos() Function

The strpos() function helps to detect the position of the first occurrence of a string inside another one.

This function is considered case-sensitive and binary-safe.

Also, you can meet functions relative to strpos(). Among them are:

  • strrpos(): aimed at detecting the position of a string’s last occurrence inside another string.
  • stripos(): aimed at detecting the position of a string’s first occurrence inside another string.
  • strripos(): aimed at detecting the position of a string’s last occurrence inside another string.