php：unset,array_splice的用法区别实例详解

<?php 
$arr = array(&#39;a&#39;,&#39;b&#39;,&#39;c&#39;,&#39;d&#39;);
unset($arr[1]);
print_r($arr);
?>

<?php 
$arr = array(&#39;a&#39;,&#39;b&#39;,&#39;c&#39;,&#39;d&#39;); 
array_splice($arr,1,1); 
print_r($arr); 
?>

<?php
$arr2 = array(1,3, 5,7,8);
foreach ($arr2 as $key=>$value){  
    if ($value === 3)    
    unset($arr2[$key]);
}
var_dump($arr2);
?>

<?php  
$array = (&#39;a&#39; => "abc", &#39;b&#39; => "bcd",&#39;c&#39; =>"cde",&#39;d&#39; =>"def",&#39;e&#39;=>"");  
array_filter($array);  
echo "<pre class="brush:php;toolbar:false">";  
print_r($array);
?>