PHP Conference Nagoya 2025

str_starts_with

(PHP 8)

str_starts_withChecks if a string starts with a given substring

Опис

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

Performs a case-sensitive check indicating if haystack begins with needle.

Параметри

haystack

The string to search in.

needle

The substring to search for in the haystack.

Значення, що повертаються

Returns true if haystack begins with needle, false otherwise.

Приклади

Приклад #1 Using the empty string ''

<?php
if (str_starts_with('abc', '')) {
echo
"All strings start with the empty string";
}
?>

Поданий вище приклад виведе:

All strings start with the empty string

Приклад #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';
}

?>

Поданий вище приклад виведе:

The string starts with 'The'
"the" was not found because the case does not match

Примітки

Зауваження: Ця функція є бінарно безпечною.

Прогляньте також

  • 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

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