数据相关函数
$a[]="a1"; $a[]="a2"; $a[]="a3"; print_r($a); unset($a[1]); print_r($a);
implode(separator,array)
<?php $arr = array('Hello','World!'); echo implode(" ",$arr); ?>
explode(separator,string,limit)
<?php $str = "Hello world!"; print_r (explode(" ",$str)); ?>