数组的概念
数组（array）是 PHP 中一个非常重要的概念，我们可以把数组看做一系列类似的数据的集合，实际上数组是一个有序图。
PHP 还提供了超过 70 个内建函数来操作数组。
由于数组在php中比较重要，并且不易掌握，本节将使用实例进行一一讲解。
- PHP 数组基本操作
- PHP print_r 与 var_dump 输出数组
- PHP is_array() 检测变量是否是数组
- PHP 数组遍历 foreach 语法结构
- PHP 数组之count 函数
- PHP 检查数组中是否存在某个值 in_array 函数
- PHP array_key_exists检查键名或索引是否存在于数组中
- PHP 在数组中搜索给定的值 array_search 函数
- PHP list() 将数组中的值赋给变量
- PHP 数组排序 sort、asort 及 ksort 系列函数
- PHP 对多个数组或多维数组进行排序 array_multisort 函数
- PHP 将数组打乱 shuffle 函数
原文地址：http://www.manongjc.com/php/php_array.html
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