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Examples of classic operations on PHP arrays (traversing arrays, basic operations)

黄舟
黄舟Original
2017-08-23 09:04:251152browse

The following editor will bring you an article on basic operations of PHP arrays and classic operation examples of traversing arrays. The editor thinks it’s pretty good, so I’ll share it with you now and give it as a reference. Let’s follow the editor and take a look.

The example is as follows:


<?php

索引数组
//数组第一种定义
 $arr = array(1,2,3);
var_dump($arr);
 //数组第二种定义
$arr = [1,2,3];
var_dump($arr);
 //数组第三种定义
$arr[0] = 7;
$arr[1] = "hello";
var_dump($arr);

echo $arr[2];//取值 

关联数组


$arr = array("name"=>"小李","sex"=>"女","age"=>"20");
echo $arr["sex"]; 

遍历数组

//for循环遍历  适用于索引数组
 $arr = [1,5,6,9,4,6,8];
for($i=0;$i<count($arr);$i++){
 echo $arr[$i].&#39;<br>&#39;; 
} ;

//foreach循环遍历  适用于索引和关联数组
$arr = array("name"=>"小李","sex"=>"女","age"=>"20");
foreach($arr as $k=>$v){
 //echo $k.&#39;:&#39;.$v.&#39;<br>&#39;; 
 echo "{$k}:{$v}<br>";
}; 


$arr = [1,5,6,9,4,6,8];
foreach($arr as $k){
 echo $k.&#39;<br>&#39;; 
};


$arr = array("name"=>"小李","sex"=>"女","age"=>"20");
var_dump(each($arr));


 list($a,$b) = array(name,小李);
echo "{$a},{$b}"; 


list和each结合遍历
/* $arr = array("name"=>"小李","sex"=>"女","age"=>"20");
while(list($k,$v)=each($arr)){
 echo "{$k}:{$v}<br>";
} */

指针遍历
/* $arr = array("name"=>"小李","sex"=>"女","age"=>"20");
echo current($arr);//取value
echo key($arr);//取key
next($arr);
echo current($arr);
echo key($arr);
prev($arr);
echo current($arr);
echo key($arr);
end($arr);
echo current($arr);
echo key($arr);
reset($arr);
echo key($arr).&#39;:&#39;.current($arr).&#39;<br>&#39;; */

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