array_pad() 用值将数组填补到指定长度
【功能】
该函数将返回指定数组的一个复制，并用指定的值将其填补到指定的长度。
如果指定长度为正，则数组被填补到右侧，如果为负则从左侧开始填补。
如果指定长度的绝对值小于或等于原数组的长度，则没有任何填补
有可能一次最多填补1048576个数组元素
【使用范围】
php4、php5.
【使用】
array array_pad( array input,int pad_size,mixed pad_value )
input/必需/原数组
pad_size/必需/要填补的指定长度
pad_value/必需/为指定的值
【示例】
[php]
$input=array(12,10,9);
var_dump( array_pad($input,5,0) );
var_dump( array_pad($input,-7,-1) );
var_dump( array_pad($input,2,"noop") );
/*
array(5) {
[0]=>
int(12)
[1]=>
int(10)
[2]=>
int(9)
[3]=>
int(0)
[4]=>
int(0)
}
array(7) {
[0]=>
int(-1)
[1]=>
int(-1)
[2]=>
int(-1)
[3]=>
int(-1)
[4]=>
int(12)
[5]=>
int(10)
[6]=>
int(9)
}
array(3) {
[0]=>
int(12)
[1]=>
int(10)
[2]=>
int(9)
}
*/
摘自 zuodefeng的笔记
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