php数组函数-array_pad()
2015-12-10 14:00
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array_pad()函数向一个数组插入带有指定值的指定数量的元素。array_pad(array,size,value);array:必需。规定数组size:必需。指定的长度。正数则填补到右侧,负数则填补到则侧value:必需。用来填补的值注:如果设置了负的长度值,该函数会在原始数组之前插入新元素。注:如果size参数小于原始数组的长度,该函数不会删除任何元素。<?php
$a = array("Dog","Cat");
print_r(array_pad($a,5,0));
?>输出:Array ( [0] => Dog [1] => Cat [2] => 0 [3] => 0 [4] => 0 )带有负的size参数:<?php
$a = array("Dog","Cat");
print_r(array_pad($a,-5,0));
?>输出:Array ( [0] => 0 [1] => 0 [2] => 0 [3] => Dog [4] => Cat )<?php
$a = array("Dog","Cat","Horse","Fish");
print_r(array_pad($a,3,0));
?>输出:Array ( [0] => Dog [1] => Cat [2] => Horse [3] => Fish )
$a = array("Dog","Cat");
print_r(array_pad($a,5,0));
?>输出:Array ( [0] => Dog [1] => Cat [2] => 0 [3] => 0 [4] => 0 )带有负的size参数:<?php
$a = array("Dog","Cat");
print_r(array_pad($a,-5,0));
?>输出:Array ( [0] => 0 [1] => 0 [2] => 0 [3] => Dog [4] => Cat )<?php
$a = array("Dog","Cat","Horse","Fish");
print_r(array_pad($a,3,0));
?>输出:Array ( [0] => Dog [1] => Cat [2] => Horse [3] => Fish )
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