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php-Arrays函数-array_shift-移除数组开头的一个单元

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Release: 2016-06-13 10:49:52
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array_shift() 移除数组开头的一个单元

【功能】
         该函数将弹出并返回array数组的开头一个单元,然后将数组的长度减一
         所有数字键名将改为从零开始计数
         如果array为空或不是数组将返回null
【使用范围】
         php4、php5.
【使用】
         mixed array_shift( array &array )
         array/必需/即将进行函数处理数组
【示例】
[php]
$array = array('orange','banana','apple'); 
var_dump($array); 
var_dump(array_shift($array)); 
var_dump($array); 
/*
array(3) {
  [0]=>
  string(6) "orange"
  [1]=>
  string(6) "banana"
  [2]=>
  string(5) "apple"
}
string(6) "orange"
array(2) {
  [0]=>
  string(6) "banana"
  [1]=>
  string(5) "apple"
}
*/ 

 


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