在php中像数组中添加元素比较常见的是array_push函数,即数组的入栈操作,但是这个函数是将元素添加到数组的末尾,如果需要将数组元素压入到数组的头部(即第一个元素)该如何操作呢?
使用php内置函数 array_unshift,下面就将 array_unshift 这个函数的用法列举一下.
array_unshift
该函数的作用是在数组开头插入一个或多个元素,被加上的元素作为一个整体添加,这些添加的元素在数组中的顺序和在参数中的顺序一样,修改后的数组中所有的数值键名将修改为从零开始重新计数,所有的文字键名保持不变,该函数会返回操作后数组中元素的个数.
语法:int array_unshift(array &$array ,mixed $var [,mixed $… ])
PHP实例代码如下:
- <!–?php
- $queue = array("phpfensi.com",".com");
- array_unshift($queue,"apple","raspberry");
- print_r($queue);
- /*以上例程会输出：
- Array
- (
- [0] => apple
- [1] => raspberry
- [2] => phpfensi.com
- [3] => .com
- )*/
当然我们还可以直接使用其它的办法了,如创建一个数组重新给他赋值即可.
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波比源码 » php数组元素添加到数组头部(array_unshift的用法)
波比源码 » php数组元素添加到数组头部(array_unshift的用法)
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