使用PHP做数据处理时会涉及到大量的数组操作,这里我就记下各种数组处理函数的使用方法,好记性不如烂笔头!!
一、array_push的使用方法:将一个或多个单元压入数组的末尾(入栈)
说明:int array_push ( array &$array , mixed $var [, mixed $... ] ) 参数说明:array是输入的数组 $var要压入的值
这里的 mixed 说明该参数可以接受多种不同的(但不一定是所有的)类型。
array_push() 将 array 当成一个栈,并将传入的变量压入 array 的末尾。array 的长度将根据入栈变量的数目增加。和如下效果相同:
$array[] = $var;
?>
并对每个 var 重复以上动作,相当于对$array[]执行了多次赋值操作。
返回值:返回处理之后数组元素的个数
注意:(1)如果用 array_push() 来给数组增加一个单元,还不如用$array[] =(对数组直接赋值),因为这样没有调用函数的额外负担。
(2)如果第一个参数不是数组,array_push() 将发出一条警告。这和 $var[] 的行为不同,后者会新建一个数组。

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