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php数组索引与键值操作技巧实例分析_PHP

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Release: 2016-05-30 08:46:01
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本文实例讲述了php数组索引与键值操作技巧。分享给大家供大家参考。具体如下:

<&#63;php 
$array = array("a", "b","c"); //定义数组 
$array[] = "Simon"; //增加一个新的数组元素 
print_r($array); //输出数组 
&#63;> 

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<&#63;php 
$array = array("a", "b","c"); //定义数组 
$array[9] = "Simon"; //增加一个新的数组元素 
print_r($array); //输出数组 
&#63;> 

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<&#63;php 
//创建一个简单的数组 
$array = array(0=>1, 1=>2, 2=>3, 3=>4, 6=>5); 
print_r($array); 
//现在把数组中键为2的值更新为100 
$array[2] = 100; 
print_r($array); 
//现在添加一个键 
$array["X"] = 50; 
print_r($array); 
//现在删除所有键,但保持数组本身的结构 
foreach($array as $i => $value)  
{ 
  unset($array[$i]); 
} 
print_r($array); 
//再添加一个键 
$array[] = 25; 
print_r($array); 
//使用array_values函数进行重新索引 
$array = array_values($array); 
$array[] = 13; 
print_r($array); 
&#63;>

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希望本文所述对大家的php程序设计有所帮助。

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