PHP学习之数组篇

<?php
    #数组的定义方式1
    $area = array("beijing","changsha","wuhan");
    $areaCode = array("010"=>"beijing","0731"=>"changsha","020"=>"wuhan");
    
    #数组的定义方式2
    $student[] = "zhangsan";
    $student[] = "lisi";
    $student[] = "wangwu";
    
    $stuInfo[] = array("a001"=>"zhangsan");
    $stuInfo[] = array("a002"=>"wangwu");
    
    #is_array()
    echo 'is_array()检测:'.(is_array($area) == 1 ? "true" : "false");
    
    #foreach array
    foreach($areaCode as $k => $v){
        printf("<br/>%s => %s",$k,$v);
    }
    
    #用于定义值填充数组
    $count = range(0, 100);
    var_dump($count);
    
    $t = range("a", "z");
    print_r($t);
    
    $x = range(0, 100,2); #0-100的偶数
    print_r($x);
    
    echo "<hr/>";
    
    #添加和删除数组元素
    /*
     * 1.array_unshift() 在数组头部添加元素
     * 2.array_push() 在数组尾部添加元素
     * 3.array_shift() 在数组头部删除元素
     * 4.array_pop() 在数组尾部删除元素
     * */
    
    array_unshift($area, "shenzhen");
    print_r($area);
    echo "<hr/>";
    
    array_shift($area);
    print_r($area);
    echo "<hr/>";
    
    array_push($area, "dongguan");
    print_r($area);
    echo "<hr/>";
    
    array_pop($area);
    print_r($area);
    echo "<hr/>";
    
    #定位数组元素
    /*
     * 1.in_array()
     * 2.array_key_exists()
     * 3.array_search()
     * */
    echo (in_array("beijing",$area) == 1 ? "true" : "false");
    echo "<hr/>";
    
    echo array_key_exists("007", $areaCode) == 1 ? "true" : "false";
    echo "<hr/>";
    
    $s = array_search("changsha", $areaCode);
    if($s){
        echo $s.":".$areaCode[$s];
    }
    
    #获取数组的Key和Value集合
    $ks = array_keys($areaCode);
    echo "<hr/>";
    print_r($ks);
    
    $vs = array_values($areaCode);
    echo "<hr/>";
    print_r($vs);
    
    #遍历数组
    while($key = key($area)){
        printf("<br/>key:%s",$key);
        next($area);
    }
    
    #向函数传递数组值
    $cc = array(1,2,3,4,5,6,7);
    echo "<hr/>";
    function Add(&$num)
    {
        $num += 10;
    }
    
    array_walk($cc, "Add");
    print_r($cc);
    
    #计算数组大小
    echo "<hr/>";
    echo count($area);
    
    #数组排序
    $r = array_reverse($area);
    echo "<hr/>";
    print_r($r);
    
    sort($r);
    echo "<hr/>";
    print_r($r);
    
    #数组的合并与连接
    #$d = array_merge($a,$b);
    #array_combine($keys, $values)
?>