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str_contains

(PHP 8)

str_contains — Determine 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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User Contributed Notes 8 notes

down

scm6079 ¶

1 year ago


For earlier versions of PHP, you can polyfill the str_contains function using the following snippet:

<?php
// based on original work from the PHP Laravel framework
if (!function_exists('str_contains')) {
    function str_contains($haystack, $needle) {
        return $needle !== '' && mb_strpos($haystack, $needle) !== false;
    }
}
?>

down

aisunny7 dot xy at gmail dot com ¶

4 months ago


The polyfill that based on original work from the PHP Laravel framework had a different behavior;

when the $needle is `""` or `null`:
php8's will return `true`;
but, laravel'str_contains will return `false`;

when php8.1, null is deprecated, You can use `$needle ?: ""`;

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juliyvchirkov at gmail dot com ¶

10 months ago


<?php

// Polyfill for PHP 4 - PHP 7, safe to utilize with PHP 8

if (!function_exists('str_contains')) {
    function str_contains (string $haystack, string $needle)
    {
        return empty($needle) || strpos($haystack, $needle) !== false;
    }
}

down

drupalista dot com dot br at gmail dot com ¶

1 month ago


private function contains(array $needles, string $type, string $haystack = NULL, string $filename = NULL) : bool {
        if (empty($needles)) return FALSE;
        if ($filename)
            $haystack = file_get_contents($filename);

        $now_what = function(string $needle) use ($haystack, $type) : array {
            $has_needle = str_contains($haystack, $needle);
            if ($type === 'any' && $has_needle)
                return ['done' => TRUE, 'return' => TRUE];

            if ($type === 'all' && !$has_needle)
                return ['done' => TRUE, 'return' => FALSE];

            return ['done' => FALSE];
        };

        foreach ($needles as $needle) {
            $check = $now_what($needle);
            if ($check['done'])
                return $check['return'];
        }
        return TRUE;
    }

    function containsAny(array $needles, string $haystack = NULL, string $filename = NULL) : bool {
        return self::contains($needles, 'any', $haystack, $filename);
    }

    function containsAll(array $needles, string $haystack = NULL, string $filename = NULL) : bool {
        return self::contains($needles, 'all', $haystack, $filename);
    }

down

olivertasche+nospam at gmail dot com ¶

1 year ago


The code from "me at daz dot co dot uk" will not work if the word is
- at the start of the string
- at the end of the string
- at the end of a sentence (like "the ox." or "is that an ox?")
- in quotes
- and so on.

You should explode the string by whitespace, punctations, ... and check if the resulting array contains your word OR try to test with a RegEx like this:
(^|[\s\W])+word($|[\s\W])+

Disclaimer: The RegEx may need some tweaks

down

-3

AuxData ¶

6 months ago


Until PHP 8 was released, many-a-programmer were writing our own contain() functions. Mine also handles needles with logical ORs (set to '||').
Here it is.

function contains($haystack, $needle, $offset){
    $OR = '||';
    $result = false;
    
    $ORpos = strpos($needle, $OR, 0);
    if($ORpos !== false){ //ORs exist in the needle string
        $needle_arr = explode($OR, $needle);
        for($i=0; $i < count($needle_arr); $i++){
            $pos = strpos($haystack, trim($needle_arr[$i]), $offset);
            if($pos !== false){
                $result = true;
                break;
            }
        }        
    } else {
        $pos = strpos($haystack, trim($needle), $offset);
        if($pos !== false){
          $result = true;
        }
    }
  return($result);
}

Call: contains("Apple Orange Banana", "Apple || Walnut", 0);
Returns: true

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-30

kadenskinner at gmail dot com ¶

1 year ago


<?php

$needle = '@';
$haystack = 'user@example.com';

if (!str_contains($haystack, $needle)){
echo 'There is not an @ in haystack';
}else{
echo 'There is an @ in haystack';
}

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-53

me at daz dot co dot uk ¶

1 year ago


# Watch out for aberrant partial matches

$string = 'The lazy fox jumped over the fence';

if (str_contains($string, 'ox')) {
    echo 'The string "ox" was found in the string because it was a partial match';
} else {
    echo '"ox" was not found';
}
//output: The string "ox" was found in the string because it was a partial match

# use spaces for full word matching

$string = 'The lazy fox jumped over the fence';

if (str_contains($string, ' ox ')) {
    echo 'The string " ox " was found in the string because it was a partial match';
} else {
    echo '" ox " was not found';
}
//output:  " ox " was not found

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