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php-Arrays函数-array_search-在数组中查找给定的值并返回相应的键名

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Release: 2016-06-13 10:49:54
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array_search() 在数组中查找给定的值并返回相应的键名

【功能】
         该函数将在指定的数组中查找某一个给定的值,并在找到的情况下返回该值的键名否则返回false。
【使用范围】
         php4>=4.0.5、php5.
【使用】
         mixed array_search( mixed needle,array haystack[,bool strict]  )
         needle/必需/要查找的值
         haystack/必需/即将进行搜索操作的原始数组
         strict/可选/true 则函数还将在haystack中检查needle的类型
         如果needle在haystack中不止一次出现,则返回第一个匹配的建
【示例】
[php]
$array=array('blue','red','green','red'); 
echo $key=array_search('green',$array); 
echo "\n"; 
echo $key=array_search('red',$array,false); 
/*
2
1
*/ 

 


摘自 zuodefeng的笔记

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