在 strpos 中使用数组作为针 [英] Using an array as needles in strpos

问题描述

在搜索字符串时，如何将 strpos 用于针头数组?例如:

How do you use the strpos for an array of needles when searching a string? For example:

$find_letters = array('a', 'c', 'd');
$string = 'abcdefg';

if(strpos($string, $find_letters) !== false)
{
    echo 'All the letters are found in the string!';
}

因为用这个的时候不行，要是有这样的就好了

Because when using this, it wouldn't work, it would be good if there was something like this

推荐答案

@Dave 来自 http://www.php.net/manual/en/function.strpos.php#107351

function strposa($haystack, $needles=array(), $offset=0) {
        $chr = array();
        foreach($needles as $needle) {
                $res = strpos($haystack, $needle, $offset);
                if ($res !== false) $chr[$needle] = $res;
        }
        if(empty($chr)) return false;
        return min($chr);
}

使用方法:

$string = 'Whis string contains word "cheese" and "tea".';
$array  = array('burger', 'melon', 'cheese', 'milk');

if (strposa($string, $array, 1)) {
    echo 'true';
} else {
    echo 'false';
}

将返回true，因为array cheese".

更新:改进的代码，当找到第一根针时停止:

Update: Improved code with stop when the first of the needles is found:

function strposa(string $haystack, array $needles, int $offset = 0): bool 
{
    foreach($needles as $needle) {
        if(strpos($haystack, $query, $offset) !== false) {
            return true; // stop on first true result
        }
    }

    return false;
}
$string = 'This string contains word "cheese" and "tea".';
$array  = ['burger', 'melon', 'cheese', 'milk'];
var_dump(strposa($string, $array)); // will return true, since "cheese" has been found

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