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(PHP 4 >= 4.1.0, PHP 5)
vprintf — Gibt einen formatierten String aus
Zeigt die Werte eines Arrays als formatierten String entsprechend der Formatanweisungen (siehe Beschreibung der Formatierungsmöglichkeiten der Funktion sprintf()) an.
Arbeitet wie printf(), akzeptiert jedoch ein Array anstelle mehrerer Werte als Argument.
Die Dokumentation der sprintf() enthält die vollständige Beschreibung des format-Parameters.
Gibt die Länge des Ausgabestrings zurück.
Beispiel #1 vprintf(): mit Nullen aufgefüllte Ganzzahlen
<?php
vprintf("%04d-%02d-%02d", explode('-', '1988-8-1')); // 1988-08-01
?>
<?php
$string = 'The site runs on PHP '.phpversion();
preg_match('/php ((\d)\.\d\.\d+)/i',$string,$matches);
print_r($matches);
vprintf('Match: %s<br /> Version %s; Major:%d.',$matches);
?>
output:
Array ( [0] => PHP 5.2.5 [1] => 5.2.5 [2] => 5 )
Match: PHP 5.2.5 Version 5.2.5; Major:5.
For preg_match:
If matches is provided, then it is filled with the results of search. $matches[0] will contain the text that matched the full pattern, $matches[1] will have the text that matched the first captured parenthesized subpattern, and so on.
For blocks of text, sprintf() is slow according to my tests.
Also, having the mapping between place-holders and the list of actual variables or datastructures often makes this code difficult to read. But the printf() family are widely supported and have a huge range of nice features. Performance is a cold mistress though!
From an ease-of-reading and maintenance, debugging point of view, I much prefer HEREDOC and "...{$variable}..." methods.
For a block of HTML markup with place holders, the fastest by far was:-
?>
<div> markup etc<?= $variable ?>more markup
<?
My tests comprised 20 runs of a loop of 1 million iterations with output buffering, ditching the buffer on each loop.
The timings ranged from average 2.1msec/million repetitions for the <?= $var ?> method up to 7.6msec/million using printf().
I'll try some benchmarking tools too, since I just wrote this myself and it could be introducing bias, but they've run on dev servers with low load.
Hopefully interesting.
To toolofthesystem at gmail dot com:
You don't need to use output buffering with vprintf() because you can use vsprintf(), which has the same functionality as vprintf(), except that it returns the resulting string instead of outputting it.
This function comes useful sometimes when trying to list information returned from MySQL:
function print_sql($query,$printf){
$sql_sql = mysql_query($query);
while($sql = mysql_fetch_row($sql_sql)){
vprintf($printf,$sql);
}
}
Unfortunately, this seems to sneak its way past output buffering when I tried creating an argument to allow it to be contained in a returned string... either that or I didn't do it right.
I wanted to achieve (something like) this:
<?
$format = "A %s %s %s.\n";
$array1 = Array("monkey", "cow", "rooster");
$array2 = Array("eats", "goes", "crows");
$array3 = Array("bananas", "moo", "in the morning");
printf($format, $array1, $array2, $array3);
?>
Output:
A monkey eats bananas.
A cow goes moo.
A rooster crows in the morning.
but I couldn't find any php function to put in for printf that would work (vprintf comes close). So I created this little function (and used it to create a select box):
<?
/*
printf_arrays( string format, [array args[, array ...]] )
*/
function printf_arrays($format) {
$args = func_get_args();
array_shift($args); // get rid of format
for($i=0; $i<count($args[0]); $i++) {
$pfargs = Array();
foreach($args as $arr) $pfargs[] = (is_array($arr) && $arr[$i]) ? $arr[$i] : '';
vprintf($format, $pfargs);
}
}
$months = Array(
'01'=>'Jan',
'02'=>'Feb',
/* etc. */
);
?>
<select name="month">
<? printf_arrays('<option value="%s">%s</option>', array_keys($months), array_values($months)) ?>
</select>
Anyone else have any better ideas? Is there a built-in php function I missed that does this already?
i know that you can use %1$s or %3$s to select the first or third string but how can you or can you use array names to select it
something like %'user'$s $'email'$s
i tend to add things to my databases over time and this could save loads of recoding
<?php
$fruits = array(1, 'banana',1, 'apples', 3, 'oranges', 2, 'peaches');
vprintf("I have %d %s, %d %s, %d %s and %d %s.", $fruits);
?>
Output:
I have 1 banana, 1 apples, 3 oranges and 2 peaches.
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