超越PHP - Exceed PHP: array_pad

说明

array array_pad ( array input, int pad_size, mixed pad_value)

array_pad() 返回 input 的一个拷贝，并用 pad_value 将其填补到 pad_size 指定的长度。如果 pad_size 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 pad_size 的绝对值小于或等于 input 数组的长度则没有任何填补。

例子 1. array_pad() 例子

<?php $input = array (12, 10, 9); $result = array_pad ($input, 5, 0); // result is array (12, 10, 9, 0, 0) $result = array_pad ($input, -7, -1); // result is array (-1, -1, -1, -1, 12, 10, 9) $result = array_pad ($input, 2, "noop"); // not padded ?>

参见 array_fill() 和 range()。

add a note User Contributed Notes
array_pad

ethanhunt314 at hotmail dot com
10-Dec-2000 08:25

This is useful when using next() and prev() function in a while loop to
traverse an array. 



For example the following code will only
output up to 8.



<?php

$test[] = "1";

$test[]
= "2";

$test[] = "3";

$test[] =
"4";

$test[] = "5";

$test[] =
"6";

$test[] = "7";

$test[] =
"8";

$test[] = "9";

$test[] =
"10";

$test[] = " ";

$test[] = "
";

$test[] = " ";



$count =
count($test);



while($i < $count) {



$now =
current($test);

echo
"$now";



next($test);

next($test);

next($test);

prev($test);

prev($test);

prev($test);





$i++;

next($test);

}

?>



But
if you use:

$test = array_pad($test, 13, " ");



you
will get all of your output.

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