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str_repeat

(PHP 4, PHP 5, PHP 7, PHP 8)

str_repeat — 重复一个字符串

说明

str_repeat(string $string, int $times): string

返回 string 重复 times 次后的结果。

参数

string

待操作的字符串。

times

string 被重复的次数。

times 必须大于等于 0。如果 times 被设置为 0，函数返回空字符串。

返回值

返回重复后的字符串。

示例

示例 #1 str_repeat() 示例

<?php
echo str_repeat("-=", 10);
?>

以上示例会输出：

 
-=-=-=-=-=-=-=-=-=-=

参见

for
str_pad() - 使用另一个字符串填充字符串为指定长度
substr_count() - 计算字串出现的次数

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User Contributed Notes 5 notes

down

Damien Bezborodov ¶

14 years ago

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
?,?,?

down

Alexander Ovsiyenko ¶

5 years ago

http://php.net/manual/en/function.str-repeat.php#90555

Damien Bezborodov , yeah but execution time of your solution is 3-5 times worse than str_replace.

<?php

function spam($number) {
    return str_repeat('test', $number);
}

function spam2($number) {
    return implode('', array_fill(0, $number, 'test'));
}

//echo spam(4);
$before = microtime(true);
for ($i = 0; $i < 100000; $i++) {
    spam(10);
}
echo microtime(true) - $before , "\n"; // 0.010297
$before = microtime(true);
for ($i = 0; $i < 100000; $i++) {
    spam2(10);
}
echo microtime(true) - $before; // 0.032104

down

claude dot pache at gmail dot com ¶

14 years ago

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;
}
?>

down

Anonymous ¶

12 years ago

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 ...

down

-10

Anonymous ¶

20 years ago

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.

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