array_splice函数使用方法
array_splice() 函数从数组中移除选定的元素,并用新元素取代它。该函数也将返回包含被移除元素的数组。
提示:如果函数没有移除任何元素(length=0),则将从 start 参数的位置插入被替换数组
注释:不保留被替换数组中的键名。
<?php $a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow"); $a2=array("a"=>"purple","b"=>"orange");array_splice($a1,0,2,$a2); print_r($a1); ?>

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