You can use this in PHP versions less than 8.
<?php
function str_starts_with ( $haystack, $needle ) {
return strpos( $haystack , $needle ) === 0;
}
str_starts_with
(PHP 8)
str_starts_with — Checks if a string starts with a given substring
Description
str_starts_with(string
$haystack, string $needle): bool
Performs a case-sensitive check indicating if
haystack begins with needle.
Liste de paramètres
-
haystack -
The string to search in.
-
needle -
The substring to search for in the
haystack.
Valeurs de retour
Returns true if haystack begins with
needle, false otherwise.
Exemples
Exemple #1 Using the empty string ''
<?php
if (str_starts_with('abc', '')) {
echo "All strings start with the empty string";
}
?>
L'exemple ci-dessus va afficher :
All strings start with the empty string
Exemple #2 Showing case-sensitivity
<?php
$string = 'The lazy fox jumped over the fence';
if (str_starts_with($string, 'The')) {
echo "The string starts with 'The'\n";
}
if (str_starts_with($string, 'the')) {
echo 'The string starts with "the"';
} else {
echo '"the" was not found because the case does not match';
}
?>
L'exemple ci-dessus va afficher :
The string starts with 'The' "the" was not found because the case does not match
Notes
Note: Cette fonction gère les chaînes binaires.
Voir aussi
- str_contains() - Determine if a string contains a given substring
- str_ends_with() - Checks if a string ends with a given substring
- stripos() - Recherche la position de la première occurrence dans une chaîne, sans tenir compte de la casse
- strrpos() - Cherche la position de la dernière occurrence d'une sous-chaîne dans une chaîne
- strripos() - Cherche la position de la dernière occurrence d'une chaîne contenue dans une autre, de façon insensible à la casse
- strstr() - Trouve la première occurrence dans une chaîne
- strpbrk() - Recherche un ensemble de caractères dans une chaîne de caractères
- substr() - Retourne un segment de chaîne
- preg_match() - Effectue une recherche de correspondance avec une expression rationnelle standard
add a note
User Contributed Notes 2 notes
Paul Phillips ¶
3 years ago
jgusta ¶
3 years ago
With credit to Paul Phillips for the original polyfill posted.
If you do not have PHP 8, you can use these functions to get the capability of the new string functions.
But! Remember to use a conditional check to make sure the function is not already defined.
<?php
// source: Laravel Framework
// https://github.com/laravel/framework/blob/8.x/src/Illuminate/Support/Str.php
if (!function_exists('str_starts_with')) {
function str_starts_with($haystack, $needle) {
return (string)$needle !== '' && strncmp($haystack, $needle, strlen($needle)) === 0;
}
}
if (!function_exists('str_ends_with')) {
function str_ends_with($haystack, $needle) {
return $needle !== '' && substr($haystack, -strlen($needle)) === (string)$needle;
}
}
if (!function_exists('str_contains')) {
function str_contains($haystack, $needle) {
return $needle !== '' && mb_strpos($haystack, $needle) !== false;
}
}
?>
This keeps it from breaking in case you upgrade and forget that you added it. This is a good practice generally when using the global scope for your helper functions.
