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
Descrierea
str_starts_with
( string
$haystack
, string $needle
) : bool
Performs a case-sensitive check indicating if
haystack begins with needle.
Parametri
-
haystack -
The string to search in.
-
needle -
The substring to search for in the
haystack.
Valorile întoarse
Returns true if haystack begins with
needle, false otherwise.
Exemple
Example #1 Using the empty string ''
<?php
if (str_starts_with('abc', '')) {
echo "All strings start with the empty string";
}
?>
Exemplul de mai sus va afișa:
All strings start with the empty string
Example #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($string, 'the')) {
echo 'The string starts with "the"';
} else {
echo '"the" was not found because the case does not match';
}
?>
Exemplul de mai sus va afișa:
The string starts with 'The' "the" was not found because the case does not match
Note
Notă: Această funcție acceptă și date binare.
A se vedea și
- str_contains() - Determine if a string contains a given substring
- str_ends_with() - Checks if a string ends with a given substring
- stripos() - Find the position of the first occurrence of a case-insensitive substring in a string
- strrpos() - Find the position of the last occurrence of a substring in a string
- strripos() - Find the position of the last occurrence of a case-insensitive substring in a string
- strstr() - Find the first occurrence of a string
- strpbrk() - Search a string for any of a set of characters
- substr() - Return part of a string
- preg_match() - Perform a regular expression match
add a note
User Contributed Notes 3 notes
Paul Phillips ¶
3 years ago
jgusta ¶
3 years ago
With credit to Paul Phillips for the original polyfill posted.
If you do not have PHP 8, you can use these functions to get the capability of the new string functions.
But! Remember to use a conditional check to make sure the function is not already defined.
<?php
// source: Laravel Framework
// https://github.com/laravel/framework/blob/8.x/src/Illuminate/Support/Str.php
if (!function_exists('str_starts_with')) {
function str_starts_with($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.
