<?php
echo 'PHP '.PHP_VERSION.'<br>';
$qty = 1000;
$arr = array();
for ($i = 0; $i < $qty; $i++){
$arr[] = rand(-100, 100);
}
$start = microtime(true);
for ($i = 0; $i < $qty; $i++){
foreach ($arr as $v){
$v = abs($v);
}
}
echo number_format(microtime(true) - $start, 4).'<br>';
$start = microtime(true);
for ($i = 0; $i < $qty; $i++){
foreach ($arr as $v){
if ($v < 0) $v = abs($v);
}
}
echo number_format(microtime(true) - $start, 4).'<br>';
$start = microtime(true);
for ($i = 0; $i < $qty; $i++){
foreach ($arr as $v){
if ($v < 0) $v *= -1;
}
}
echo number_format(microtime(true) - $start, 4).'<br>';
?>
Result:
PHP 7.1.33
0.0910
0.0710
0.0550
Conclusion: better to check before using the feature that the number is less than zero. Even better use multiplication by -1 than this function.
abs
(PHP 4, PHP 5, PHP 7, PHP 8)
abs — Absolute value
Bağımsız Değişkenler
-
num -
The numeric value to process
Dönen Değerler
The absolute value of num. If the
argument num is
of type float, the return type is also float,
otherwise it is int (as float usually has a
bigger value range than int).
Sürüm Bilgisi
| Sürüm: | Açıklama |
|---|---|
| 8.0.0 |
num no longer accepts internal objects which support
numeric conversion.
|
Örnekler
Örnek 1 abs() example
<?php
var_dump(abs(-4.2));
var_dump(abs(5));
var_dump(abs(-5));
?>Yukarıdaki örneğin çıktısı:
float(4.2) int(5) int(5)
add a note
User Contributed Notes 1 note
eep2004 at ukr dot net ¶
3 years ago
