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このドキュメントでは、 php中国語ネットマニュアル リリース
(PHP 4, PHP 5)
str_repeat — 重复一个字符串
$input
, int $multiplier
)
返回 input
重复
multiplier
次后的结果。
input
待操作的字符串。
multiplier
input
被重复的次数。
multiplier
必须大于等于 0。如果 multiplier
被设置为 0,函数返回空字符串。
返回重复后的字符串。
Example #1 str_repeat() 范例
<?php
echo str_repeat ( "-=" , 10 );
?>
以上例程会输出:
-=-=-=-=-=-=-=-=-=-=
[#1] Anonymous [2011-10-23 04:51:03]
hi guys ,
i've faced this example :
<?php
$my_head = str_repeat("??~", 35);
echo $my_head;
?>
so , the length should be 35x2 = 70 !!!
if we echo it :
<?php
$my_head = str_repeat("??~", 35);
echo strlen($my_head); // 105
echo mb_strlen($my_head, 'UTF-8'); // 70
?>
be carefull with characters and try to use mb_* package to make sure everything goes well ...
[#2] Damien Bezborodov [2009-04-28 00:45:19]
Here is a simple one liner to repeat a string multiple times with a separator:
<?php
implode($separator, array_fill(0, $multiplier, $input));
?>
Example script:
<?php
// How I like to repeat a string using standard PHP functions
$input = 'bar';
$multiplier = 5;
$separator = ',';
print implode($separator, array_fill(0, $multiplier, $input));
print "\n";
// Say, this comes in handy with count() on an array that we want to use in an
// SQL query such as 'WHERE foo IN (...)'
$args = array('1', '2', '3');
print implode(',', array_fill(0, count($args), '?'));
print "\n";
?>
Example Output:
bar,bar,bar,bar,bar
?,?,?
[#3] claude dot pache at gmail dot com [2009-02-10 02:25:20]
Here is a shorter version of Kees van Dieren's function below, which is moreover compatible with the syntax of str_repeat:
<?php
function str_repeat_extended($input, $multiplier, $separator='')
{
return $multiplier==0 ? '' : str_repeat($input.$separator, $multiplier-1).$input;
}
?>
[#4] Alper Kaya [2007-06-30 03:09:15]
If you want to hide a part of your password, you can use this code. It's very simple and might be required in your user management panel.
<?php
$password = "12345abcdef";
$visibleLength = 4; // 4 chars from the beginning
echo substr($password,0,4).str_repeat("*", (strlen($password)-$visibleLength));
?>
[#5] [2005-09-15 07:32:41]
In reply to what Roland Knall wrote:
It is much simpler to use printf() or sprintf() for leading zeros.
<?php
printf("%05d<br>\n", 1); // Will echo 00001
sprintf("%05d<br>\n", 1); // Will return 00001
?>
[#6] [2003-07-21 10:45:52]
str_repeat does not repeat symbol with code 0 on some (maybe all?) systems (tested on PHP Version 4.3.2 , FreeBSD 4.8-STABLE i386 ).
Use <pre>
while(strlen($str) < $desired) $str .= chr(0);
</pre> to have string filled with zero-symbols.
[#7] bryantSPAMw at geocities dot SPAM dot com [2001-10-25 04:16:27]
(For the benefit of those searching the website:)
This is the equivalent of Perl's "x" (repetition) operator, for eg. str_repeat("blah", 8) in PHP does the same thing as "blah" x 8 in Perl.