PHP中数组类型分析详解
本文将讲解PHP中数组类型分析详解
PHP的array就是一个有序的map。map是一个key和value关联的类型。
php的数组的key 可以是string类型也可以是integer类型。如果key为一个float类型,会自动的转化为integer类型。
如果没有为一个value指定一个key,integer类型的索引的最大值已经给出的话,新key就是这个最大值加1.如果这个新key已经被赋值,那么这个value将会被覆盖掉。
$arr = array(a,b,5=>c,d,e,6=>g);
echo
;<br>print_r($arr);<br>echo
代码运行结果
Array(
[0] => a
[1] => b
[5] => c
[6] => g
[7] => e)
这个样子。只所以没有value "d" 是因为 他被后面的6=>g这个给覆盖掉了
希望本篇文章能对你有所收获。

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