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searchArray($array, $value) {\n    $count = count($array);\n    for ($i = 0; $i &lt; $count; $i++) {\n        if ($array[$i] === $value) {\n            return true;\n        }\n    }\n    return false;\n}<\/pre>\n<p><strong>\u4f18\u5316\uff1a<\/strong>\u5c06\u6570\u7ec4\u8f6c\u6362\u4e3a\u5173\u8054\u6570\u7ec4\uff0c\u4f7f\u7528\u503c\u4f5c\u4e3a\u952e\uff0c\u53ef\u4ee5\u5c06\u641c\u7d22\u590d\u6742\u5ea6\u4ece O(n) \u4f18\u5316\u4e3a O(1)\u3002<\/p>\n<pre>&lt;?php\n\nfunction searchArray($array, $value) {\n    $array = array_flip($array);\n    return isset($array[$value]);\n}<\/pre>\n<p><strong>\u7ed3\u675f\u8bed<\/strong><\/p>\n<p>\u901a\u8fc7\u9075\u5faa\u672c\u6587\u63d0\u51fa\u7684\u6307\u5bfc\u539f\u5219\uff0c\u60a8\u53ef\u4ee5\u8bbe\u8ba1\u51fa\u6027\u80fd\u4f18\u5316\u4e14\u53ef\u7ef4\u62a4\u7684 PHP 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