str_contains

(PHP 8)

str_containsDetermine if a string contains a given substring

说明

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

Performs a case-sensitive check indicating if needle is contained in haystack.

参数

haystack

The string to search in.

needle

The substring to search for in the haystack.

返回值

Returns true if needle is in haystack, false otherwise.

范例

示例 #1 Using the empty string ''

<?php
if (str_contains('abc''')) {
    echo 
"Checking the existence of the empty string will always return true";
}
?>

以上例程会输出:

Checking the existence of the empty string will always return true

示例 #2 Showing case-sensitivity

<?php
$string 
'The lazy fox jumped over the fence';

if (
str_contains($string'lazy')) {
    echo 
"The string 'lazy' was found in the string\n";
}

if (
str_contains($string'Lazy')) {
    echo 
'The string "Lazy" was found in the string';
} else {
    echo 
'"Lazy" was not found because the case does not match';
}

?>

以上例程会输出:

The string 'lazy' was found in the string
"Lazy" was not found because the case does not match

注释

注意: 此函数可安全用于二进制对象。

参见

  • str_ends_with() - Checks if a string ends with a given substring
  • str_starts_with() - Checks if a string starts 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

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