Detailed explanation of PHP key value operations

This article mainly shares with you the detailed explanation of PHP key value operations, mainly in the form of code. I hope it can help you.

<?php  
//创建键值对应的数组  
$array = array(0=>1, 1=>2, 2=>3, 3=>4, 6=>5);  
print_r($array);  

//把数组中键为3的值更新为300  
$array[3] = 300;  
print_r($array);  

//现在添加一个键和值  
$array["B"] = 80;  
print_r($array);  

//现在删除所有键和值（但保持数组原本的结构）  
foreach($array as $i => $value)   
{  
unset($array[$i]);  
}  
print_r($array);  

//再添加一个键  
$array[] = 90;  
print_r($array);  

//使用array_values对数组重新索引  
$array = array_values($array);  
$array[] = 18;  
print_r($array);  

?>

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