PHP: str_repeat - Manual (original) (raw)

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

str_repeat — Repeat a string

Description

Parameters

string

The string to be repeated.

times

Number of time the string string should be repeated.

times has to be greater than or equal to 0. If the times is set to 0, the function will return an empty string.

Return Values

Returns the repeated string.

Examples

Example #1 str_repeat() example

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

The above example will output:

Found A Problem?

Damien Bezborodov ¶

16 years ago

Here is a simple one liner to repeat a string multiple times with a separator:

<?php
implode($separator, array_fill(0, <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>m</mi><mi>u</mi><mi>l</mi><mi>t</mi><mi>i</mi><mi>p</mi><mi>l</mi><mi>i</mi><mi>e</mi><mi>r</mi><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">multiplier, </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">m</span><span class="mord mathnormal">u</span><span class="mord mathnormal">lt</span><span class="mord mathnormal">i</span><span class="mord mathnormal" style="margin-right:0.01968em;">pl</span><span class="mord mathnormal">i</span><span class="mord mathnormal" style="margin-right:0.02778em;">er</span><span class="mpunct">,</span></span></span></span>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, <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>m</mi><mi>u</mi><mi>l</mi><mi>t</mi><mi>i</mi><mi>p</mi><mi>l</mi><mi>i</mi><mi>e</mi><mi>r</mi><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">multiplier, </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">m</span><span class="mord mathnormal">u</span><span class="mord mathnormal">lt</span><span class="mord mathnormal">i</span><span class="mord mathnormal" style="margin-right:0.01968em;">pl</span><span class="mord mathnormal">i</span><span class="mord mathnormal" style="margin-right:0.02778em;">er</span><span class="mpunct">,</span></span></span></span>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
?,?,?

Alexander Ovsiyenko ¶

7 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; <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>i</mi><mo>&lt;</mo><mn>100000</mn><mo separator="true">;</mo></mrow><annotation encoding="application/x-tex">i &lt; 100000; </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6986em;vertical-align:-0.0391em;"></span><span class="mord mathnormal">i</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">&lt;</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:0.8389em;vertical-align:-0.1944em;"></span><span class="mord">100000</span><span class="mpunct">;</span></span></span></span>i++) {
    spam(10);
}
echo microtime(true) - $before , "\n"; // 0.010297
$before = microtime(true);
for ($i = 0; <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>i</mi><mo>&lt;</mo><mn>100000</mn><mo separator="true">;</mo></mrow><annotation encoding="application/x-tex">i &lt; 100000; </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6986em;vertical-align:-0.0391em;"></span><span class="mord mathnormal">i</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">&lt;</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:0.8389em;vertical-align:-0.1944em;"></span><span class="mord">100000</span><span class="mpunct">;</span></span></span></span>i++) {
    spam2(10);
}
echo microtime(true) - $before; // 0.032104

claude dot pache at gmail dot com ¶