1、数组$a = array(‘a‘=>‘a‘,‘b‘=>‘b‘,‘c‘=>‘c‘)，如何将array（‘d’=>‘d‘）快速插入 a 和 b 之间？
function wpjam_array_push($array, $data=null, $key=false){ ???$data ?= (array)$data; ????$offset ?= ($key===false)?false:array_search($key, array_keys($array)); ???$offset ?= ($offset)?$offset:false; ???if($offset){ ???????return array_merge( ???????????array_slice($array, 0, $offset), ???????????$data, ???????????array_slice($array, $offset) ???????); ???}else{ ?// 没指定 $key 或者找不到，就直接加到末尾 ???????return array_merge($array, $data); ???}}$data = array("d"=>‘d‘);$b = wpjam_array_push($a,$data,"b");print_r($b);2、写一个遍历目录下所有文件以及子目录的函数
function my_scandir($dir) ?{ ?????$files = array(); ?????if ( $handle = opendir($dir) ) { ????????while ( ($file = readdir($handle)) !== false ) { ?????????????if ( $file != ".." && $file != "." ) { ?????????????????if ( is_dir($dir . "/" . $file) ) { ?????????????????????$files[$file] = scandir($dir . "/" . $file); ?????????????????}else { ?????????????????????$files[] = $file; ?????????????????} ?????????????} ?????????} ?????????closedir($handle); ?????????return $files; ?????} ?}$files=my_scandir(‘E:\PhpStudy\WWW\12_twleve_month\8-2‘);echo "<pre>";print_r($files); 3、用php实现一个双向队列。
队列是一种线性表，按照先进先出的原则进行
单向队列：只能从头进，从尾出
双向队列：头尾都可以进出
class DuiLie { ???private $array = array();//声明空数组 ????public function setFirst($item){ ???????return array_unshift($this->array,$item);//头入列 ???} ???public function delFirst(){ ???????return array_shift($this->array);//头出列 ???} ????public function setLast($item){ ????????return array_push($this->array,$item);//尾入列 ???} ???public function delLast(){ ???????return array_pop($this->array,$item);//尾出列 ???} ???public function show(){ ???????var_dump($this->array);//打印数组 ???} ???public function Del(){ ???????unset($this->array);//清空数组 ???}} ??php 常见面试题（3）
原文地址：http://www.cnblogs.com/lpblogs/p/7452342.html