(PHP 8)
str_contains — Determine if a string contains a given substring
$haystack, string $needle): bool
Performs a case-sensitive check indicating if needle is contained
in haystack.
haystackThe string to search in.
needle
The substring to search for in the haystack.
Returns true if needle is in
haystack, false otherwise.
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
Note: This function is binary-safe.