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(PHP 8)
str_starts_with — Checks if a string starts with a given substring
$haystack, string $needle): bool
Performs a case-sensitive check indicating if
haystack begins with needle.
haystack
The string to search in.
needle
The substring to search for in the haystack.
Returns true if haystack begins with
needle, false otherwise.
示例 #1 Using the empty string ''
<?php
if (str_starts_with('abc', '')) {
echo "All strings start with the empty string";
}
?>
以上例程会输出：
All strings start with the empty string
示例 #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';
}
?>
以上例程会输出：
The string starts with 'The' "the" was not found because the case does not match
注意: 此函数可安全用于二进制对象。
