<?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
Parameters
-
num -
The numeric value to process
Return Values
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).
Changelog
| Version | Description |
|---|---|
| 8.0.0 |
num no longer accepts internal objects which support
numeric conversion.
|
Examples
Example #1 abs() example
<?php
var_dump(abs(-4.2));
var_dump(abs(5));
var_dump(abs(-5));
?>The above example will output:
float(4.2) int(5) int(5)
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User Contributed Notes 1 note
eep2004 at ukr dot net ¶
3 years ago
