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str_contains

(PHP 8)

str_contains — Determine if a string contains a given substring

Description

str_contains(string $haystack, string $needle): bool

Performs a case-sensitive check indicating if needle is contained in haystack.

Parameters

haystack

The string to search in.

needle

The substring to search for in the haystack.

Return Values

Returns true if needle is in haystack, false otherwise.

Examples

Example #1 Using the empty string ''

<?php
if (str_contains('abc', '')) {
    echo "Checking the existence of the empty string will always return true";
}
?>

The above example will output:

Checking the existence of the empty string will always return true

Example #2 Showing case-sensitivity

<?php
$string = 'The lazy fox jumped over the fence';

if (str_contains($string, 'lazy')) {
    echo "The string 'lazy' was found in the string\n";
}

if (str_contains($string, 'Lazy')) {
    echo 'The string "Lazy" was found in the string';
} else {
    echo '"Lazy" was not found because the case does not match';
}

?>

The above example will output:

The string 'lazy' was found in the string
"Lazy" was not found because the case does not match

Notes

Note: This function is binary-safe.

See Also

  • str_ends_with() - Checks if a string ends with a given substring
  • str_starts_with() - Checks if a string starts with a given substring
  • stripos() - Find the position of the first occurrence of a case-insensitive substring in a string
  • strrpos() - Find the position of the last occurrence of a substring in a string
  • strripos() - Find the position of the last occurrence of a case-insensitive substring in a string
  • strstr() - Find the first occurrence of a string
  • strpbrk() - Search a string for any of a set of characters
  • substr() - Return part of a string
  • preg_match() - Perform a regular expression match

© 1997–2025 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.str-contains.php