Php/docs/function.str-starts-with
str_starts_with
(PHP 8)
str_starts_with — Checks if a string starts with a given substring
说明
str_starts_with
( string $haystack
, string $needle
) : bool
Performs a case-sensitive check indicating if
haystack begins with needle.
参数
haystack- The string to search in.
needle- The substring to search for in the
haystack.
返回值
Returns true if haystack begins with
needle, false otherwise.
范例
Example #1 Using the empty string
<?phpif (str_starts_with('abc', )) { echo "All strings start with the empty string";}?>
以上例程会输出：
All strings start with the empty string
Example #2 Showing case-sensitivity
<?php$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';}?>
以上例程会输出：
The string starts with 'The' "the" was not found because the case does not match
注释
Note: 此函数可安全用于二进制对象。
参见
- str_contains() - Determine if a string contains a given substring
- str_ends_with() - Checks if a string ends with a given substring
- stripos() - 查找字符串首次出现的位置（不区分大小写）
- strrpos() - 计算指定字符串在目标字符串中最后一次出现的位置
- strripos() - 计算指定字符串在目标字符串中最后一次出现的位置（不区分大小写）
- strstr() - 查找字符串的首次出现
- strpbrk() - 在字符串中查找一组字符的任何一个字符
- substr() - 返回字符串的子串
- preg_match() - 执行匹配正则表达式
