php基础之函数（1）

1.数组遍历

1）foreach( )方法：

<?php
$arr = array(
            "name"=>array("Tom","Jeery","Andy","Silly"),
            "age"=>array("Tom"=>"26","Jerry"=>"22","Andy"=>"39","Silly"=>"20"),
            "sex"=>array("male","male","female","female")
);

foreach($arr as $key=>$value){
    foreach($value as $keys=>$values)
        echo $arr[$key][$keys]." ";
        echo "\n";
}
?>

 

2）each( )和list( )方法：

<?php
$arr = array(
            "name"=>array("Tom","Jeery","Andy","Silly"),
            "age"=>array("Tom"=>"26","Jerry"=>"22","Andy"=>"39","Silly"=>"20"),
            "sex"=>array("male","male","female","female")
);
while(list($key,$value) = each($arr)){
    while(list($keys,$values) = each($value))
        echo $arr[$key][$keys]." ";
    echo "\n";
}
?>

 

 

2.创建数组的函数

1）range( )、array_combine( )函数：

 

<?php
//range(int low,int high[,int step])
//low 表示数组单元最小值；high表示数组单元最大值；Step为可选值，设定单元之间的步长。
$arr0 = range(2,6,2);
$arr1 = range('a','c');
//将第一个数组的值作为新数组的key，将第二个数组的值作为新数组的value
$arr = array_combine($arr0,$arr1);
print_r($arr);
?>

 

运行结果：

---------- PHP ----------
Array
(
    [2] => a
    [4] => b
    [6] => c
)

 

2）array_pad( )函数：

<?php
$arr = array("tom","22","male");
$arr1 = array("jerry","29","male");
foreach($arr1 as $key){
    //array_pad(array input,int pad_size,mixed pad_value)
    //input即要操作的数组；pad_size即指定的长度，为正则添加pad——Value到数组右侧，反之左侧；pad_Value即填补的值
    $arr = array_pad($arr,count($arr)+1,$key);//此处相当于实现了两个数组的连接
}
print_r($arr);
?>

 

 

结果如下：

 

---------- PHP ----------
Array
(
    [0] => tom
    [1] => 22
    [2] => male
    [3] => jerry
    [4] => 29
    [5] => male
)

 

3.数组统计函数

1）array_count-values( )函数：

 

<?php
$arr = array(1,1,2,2,2,3,3);
$num = array_count_values($arr);
print_r($num);
?>

 

结果如下：

 

---------- PHP ----------
Array
(
    [1] => 2
    [2] => 3
    [3] => 2
)

 

 

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