介绍几个 php4 中非常有用的"数组"函数 1 void extract (array var_array [, int extract_type ][, string prefix]]) 把一个关联数组展开为变量名和变量的值，如果有冲突则由后面的参数指定处理方法！ 如：
"blue", "size" => "medium", "shape" => "sphere"); extract ($var_array, EXTR_PREFIX_SAME, "wddx"); print "$color, $size, $shape, $wddx_sizen"; ?> 2 array compact (mixed varname [, mixed ...]) 和上面的函数相反，把变量名和变量的值保存到关联数组里面！ 如： $city = "San Francisco"; $state = "CA"; $event = "SIGGRAPH"; $location_vars = array ("city", "state"); $result = compact ("event", "nothing_here", $location_vars); $result 结果为 array ("event" => "SIGGRAPH", "city" => "San Francisco", "state" => "CA"). 3 bool in_array (mixed needle, array haystack) 判断数组中是否有这个值 4 void natsort (array array) 以自然数的方法排序数组，这时 12 将排在2的后面 $array1 = $array2 = array ("img12.png","img10.png","img2.png","img1.png"); sort($array1); echo "标准排序n"; print_r($array1); natsort($array2); echo "n自然排序n"; print_r($array2); 代码输出为: 标准排序 Array ( [0] => img1.png [1] => img10.png [2] => img12.png [3] => img2.png ) 自然排序 Array ( [3] => img1.png [2] => img2.png [1] => img10.png [0] => img12.png )
