PHP中array

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array_search() 函数用来在数组中搜索给定值，并返回对应的键名，而 array_keys() 函数用来获取数组中所有给定值的键名。下面是它们的用法示例：

array_search() 示例：

$fruits = array("apple", "banana", "orange", "grape");
$key = array_search("orange", $fruits);
if($key !== false) {echo "The key of 'orange' is: " . $key;
} else {echo "The value 'orange' was not found in the array";
}

array_keys() 示例：

$fruits = array("apple", "banana", "orange", "banana");
$keys = array_keys($fruits, "banana");
if(!empty($keys)) {echo "The keys of 'banana' are: " . implode(", ", $keys);
} else {echo "The value 'banana' was not found in the array";
}