以下是对php中的foreach函数进行了详细的分析介绍,需要的朋友可以过来参考下
Foreach 函数(PHP4/PHP5)
foreach 语法结构提供了遍历数组的简单方式。
foreach 仅能够应用于数组和对象,如果尝试应用于其他数据类型的变量,香港服务器,虚拟主机,香港空间,或者未初始化的变量将发出错误信息。
有两种语法:
复制代码 代码如下:
foreach (array_expression as $value)
statement
foreach (array_expression as $key => $value)
statement
例子1:
复制代码 代码如下:
$arr=array(1,2,3,4);
foreach($arr as $value){
echo $value."
";
}
?>
例子2:
复制代码 代码如下:
$arr=array(1,2,3,4);
foreach($arr as $key=>$value){
echo $key."=====>".$value."
";
}
?>

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