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
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