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php数组函数序列之array_search()- 按元素值返回键名_PHP教程

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Release： 2016-07-21 15:23:42
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array_search()定义和用法
array_search() 函数与 in_array() 一样，在数组中查找一个键值。如果找到了该值，匹配元素的键名会被返回。如果没找到，则返回 false。

在 PHP 4.2.0 之前，函数在失败时返回 null 而不是 false。

如果第三个参数 strict 被指定为 true，则只有在数据类型和值都一致时才返回相应元素的键名。

语法
array_search(value,array,strict)参数 描述
value 必需。规定在数组中搜索的值。
array 必需。被搜索的数组。
strict 可选。可能的值：

true
false - 默认
如果值设置为 true，还将在数组中检查给定值的类型。（参见例子 2）


例子 1

复制代码 代码如下:

$a=array("a"=>"Dog","b"=>"Cat","c"=>"Horse");
echo array_search("Dog",$a);
?>

输出：

a

www.bkjia.comtruehttp://www.bkjia.com/PHPjc/324437.htmlTechArticlearray_search()定义和用法 array_search() 函数与 in_array() 一样，在数组中查找一个键值。如果找到了该值，匹配元素的键名会被返回。如果没找到...
Related labels：
array php search value element function sequence according to array use return Key name
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