PHP extract() 函数从数组中把变量导入到当前的符号表中
定义和用法
PHP extract() 函数从数组中把变量导入到当前的符号表中。
对于数组中的每个元素,键名用于变量名,键值用于变量值。
第二个参数 type 用于指定当某个变量已经存在,而数组中又有同名元素时,extract() 函数如何对待这样的冲突。
本函数返回成功设置的变量数目。
语法
extract(array,extract_rules,prefix)
例子 1
复制代码 代码如下:
$a = 'Original';
$my_array = array("a" => "Cat","b" => "Dog", "c" => "Horse");
extract($my_array);
echo "\$a = $a; \$b = $b; \$c = $c";
?>
输出:
$a = Cat;
$b = Dog;
$c = Horse
例子 2
使用全部参数:
复制代码 代码如下:
$a = 'Original';
$my_array = array("a" => "Cat","b" => "Dog", "c" => "Horse");
extract($my_array, EXTR_PREFIX_SAME, 'dup');
echo "\$a = $a; \$b = $b; \$c = $c; \$dup_a = $dup_a;";
?>
输出:
$a = Original;
$b = Dog;
$c = Horse;
$dup_a = Cat;
PHP extract() 函数
近日在看一个牛人的代码时,看到一个非常好用的函数:extract(),它的主要作用是将数组展开,键名作为变量名,元素值为变量值,可以说为数组的操作提供了另外一个方便的工具,比方说,可以很方便的提取$_POST或者$_GET的元素,对表单提交上来的内容不能不用一一赋值,直接使用下面代码:
form.html
复制代码 代码如下:

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