学习纲要:
1.了解数组函数
2.随机输出验证码
1.数组函数:
<?php
$arr=array("name"=>"user1","age"=>"30","sex"=>"man");
foreach($arr as $key=>$val){
$keys[]=$key;
$vals[]=$val;
}
echo "<pre>";
print_r($keys);
echo "</pre>";
echo "<hr>";
echo "<pre>";
print_r($vals);
echo "</pre>";
?><?php
$arr=array("name"=>"user1","age"=>"30","sex"=>"man");
$keys=array_values($arr);
echo "<pre>";
print_r($keys);
echo "</pre>";
?>
<?php
$arr=array("user1"=>70,60,80,78,34,34,34,56,78,78);
function older($var){
return ($var>60);
}
$arr2=array_filter($arr,"older");
echo "<pre>";
print_r($arr2);
echo "</pre>";
?><?php
$arr=array("user1"=>10,"b"=>1,"c"=>3,"d"=>30);
$arr2=array_flip($arr);
ksort($arr2);
echo "<pre>";
print_r($arr2);
echo "</pre>";
?><?php
$array1 = $array2 = array("img12.png", "img10.png", "img2.png", "img1.png");
sort($array1);
echo "Standard sorting\n";
print_r($array1);
natsort($array2);
echo "\nNatural order sorting\n";
print_r($array2);
?> <?php
$arr=array("aaa","bbbbbbbbb","cc","ddddd");
//需求:
//1.按照标题长度排序
//2.标题长度变成标题字符串的key
//将数组中的value的长度取出,并作为一个新数组
//strlen($val)取出字符串的长度
foreach ($arr as $val) {
$lens[]=strlen($val);
}
array_multisort($lens,SORT_ASC,$arr);//对数组进行排序,根据第一个数组来排序第二个数组 SORT_ASC表示升序排序
sort($lens);
$arr2=array_combine($lens, $arr);//第一个数组作为第二个数组对应的key,返回一个新数组
echo "<pre>";
print_r($arr2);
echo "</pre>";
?><?php
$str="php,js,html,ces,div";
$arr=explode(",",$str);
echo "<pre>";
print_r($arr);
echo "</pre>";
?></pre><span style="white-space:pre"> </span>2.inplode();将数组组合成为字符串<span style="white-space:pre"> </span><pre name="code" class="php"><?php
$str="php,js,html,ces,div";
$arr=explode(",",$str);
$str2=implode("-",$arr);
echo "<pre>";
print_r($str2);
echo "</pre>";
?><?php
$str="php,js,html,ces,div";
$arr=explode(",",$str);
$arr2=array_reverse($arr);//讲数组中的值进行倒序
$str2=implode("-",$arr2);
echo "<pre>";
print_r($str2);
echo "</pre>";
?>
<?php
//截取总是从后往前截取
$arr = array("aa","bb","cc","dd","ee","ff","gg");
$arr2 = array_slice($arr, 0,2);//表示从0的位置截取2个 aa bb
$arr3 = array_slice($arr, -3,2);//表示从后往前数到3的位置,开始截取2个//ee ff
echo "<pre>";
print_r($arr3);
echo "</pre>";
?>
不仅拆减,而且可以添加
<?php
$arr = array("aa","bb","cc","dd","ee","ff","gg");
$arr2 = array_splice($arr, 0, 3, array("hh","ii","jj","kk"));//直接取原数组的值,并将原数组进行改变,原数组为取走以后剩下的值
echo "<pre>";
print_r($arr2);
echo "</pre>";
echo "<pre>";
print_r($arr);
echo "</pre>";
?>
array_merge();
<?php
$a = array("aa","bb","cc");
$b = array("dd","ee","ff","gg");
$arr = array_merge($a, $b);
echo "<pre>";
print_r($arr);
echo "</pre>";
?><?php
$arr = array("aa","bb","cc","dd","ee","ff","gg");
//将原数组顺序随机打乱
shuffle($arr);
//取出数组的前3个
$arr2= array_slice($arr, 0 , 3);
echo "<pre>";
print_r($arr2);
echo "</pre>";
?> <?php
//取出1-9 a-z A-Z的数组
$a = range(1, 9);
$b = range(a, z);
$c = range(A, Z);
//将3个数组合并
$d = array_merge($a,$b,$c);
//将合并后的数组打乱
shuffle($d);
//取合并后的前4位
$e = array_slice($d, 0, 4);
//将$e数组变为字符串
$f = join("", $e);
echo $f;
?>
转载请注明出处: http://blog.csdn.net/junzaivip
原文地址：http://blog.csdn.net/junzaivip/article/details/38771397
