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Optimizing PHP code | This article is intended to help you to optimize your PHP code, it will address various examples showing and comparing the time between generations of different possible solutions.
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Index :
Loops : For and While
Assigning variables: 'x' and "x"
Reading a text file: file_get_contents and fopen-fget
Infuance variables in the code
Loops: for and while
Test code for loops:
function microtime_float(){
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
$nombre_boucle = 500001;
$time_start = microtime_float();
for($i=0;$i<$nombre_boucle;$i++)
{
}
$time_end = microtime_float();
$duration_for_loop = $time_end - $time_start;)
?>
Test code while loops:
function microtime_float(){
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
$nombre_boucle = 500001;
$i = 0;
$boucle_active = true;
$time_start = microtime_float();
while ($boucle_active)
{
if($i>=$nombre_boucle){$boucle_active=false;}
$i++;
}
$time_end = microtime_float();
$duration_while_loop = $time_end - $time_start;
?>
Results for 500000 loops of 5 tests:
For loop:
0,0396s
0,0396s
0,0404s
0,0407s
0,0386s
Mean = 0,0398s
While loop:
0,0443s
0,0435s
0,0441s
0,0446s
0,0439s
Mean = 0,0441s
Conclusion :
For loop is 10% faster than the While loop in this example.
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Assigning variables: 'x' and 'x':
Code testing variable 'x':
function microtime_float(){
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
$nombre_boucle = 500001;
$time_start = microtime_float();
for($i=0;$i<$nombre_boucle;$i++)
{
$ma_variable = 'blablabla';
}
$time_end = microtime_float();
$duration_variable_01 = $time_end - $time_start - $duration_for_loop;
?>
Code testing variable "x":
function microtime_float(){
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
$nombre_boucle = 500001;
$time_start = microtime_float();
for($i=0;$i<$nombre_boucle;$i++)
{
$ma_variable = "blablabla";
}
$time_end = microtime_float();
$duration_variable_02 = $time_end - $time_start - $duration_for_loop;
?>
Results for 500000 loops of 5 tests:
Assignment of variables 'x':
0,0436s
0,0462s
0,0424s
0,0418s
0,0459s
Mean = 0,0440s
Assignment of variables "x":
0,0452s
0,0435s
0,0415s
0,0419s
0,0466s
Mean = 0,0438s
Conclusion :
The assignment of variables "x" in a performance equivalent to the assignment of variables 'x'.
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Reading a text file: file_get_contents and fopen-fget:
This test will be conducted in 2 parts: reading a text file of one line and reading a text file of 10 lines.
Test code for reading a text file with a line file_get_contents:
function microtime_float(){
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
$nombre_boucle = 10000;
$time_start = microtime_float();
$nom_fichier = "montexte.txt";
for($i=0;$i<$nombre_boucle;$i++)
{
$ma_variable = file_get_contents($nom_fichier);
}
$time_end = microtime_float();
$duration_file_get_contents = $time_end - $time_start - $duration_for_loop;
?>
Test code for reading a text file with a line-fopen fget:
function microtime_float(){
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
$nombre_boucle = 10000;
$ma_variable = "";
$time_start = microtime_float();
$nom_fichier = "montexte.txt";
for($i=0;$i<$nombre_boucle;$i++)
{
$fp = fopen($nom_fichier,"r");
while(!feof($fp))
{
$ma_variable .= fgets($fp,4096) . "\n";
}
fclose($fp);
}
$time_end = microtime_float();
$duration_fopen = $time_end - $time_start - $duration_for_loop;
?>
Test code for reading a text file of 10 lines with file_get_contents:
function microtime_float(){
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
$nombre_boucle = 10000;
$time_start = microtime_float();
$nom_fichier = "montexte10.txt";
for($i=0;$i<$nombre_boucle;$i++)
{
$ma_variable = file_get_contents($nom_fichier);
}
$time_end = microtime_float();
$duration_file_get_contents_all = $time_end - $time_start - $duration_for_loop;
?>
Test code for reading a text file of 10 lines with fopen-fget :
function microtime_float(){
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
$nombre_boucle = 10000;
$ma_variable = "";
$time_start = microtime_float();
$nom_fichier = "montexte10.txt";
for($i=0;$i<$nombre_boucle;$i++)
{
$fp = fopen($nom_fichier,"r");
while(!feof($fp))
{
$ma_variable .= fgets($fp,4096) . "\n";
}
fclose($fp);
}
$time_end = microtime_float();
$duration_fopen_all = $time_end - $time_start - $duration_for_loop;
?>
Results for 10000 loops of 5 tests:
Reading a text file of one line with file_get_contents:
0,5492s
0,5503s
0,5395s
0,5420s
0,5610s
Mean = 0,5484s
Reading a text file of one line with fopen-fget :
0,5131s
0,5070s
0,5063s
0,5039s
0,5162s
Mean = 0,5093s
Reading a text file of 10 lines with file_get_contents:
0,5525s
0,5466s
0,5499s
0,5463s
0,5559s
Mean = 0,5502s
Reading a text file of 10 lines with fopen-fget:
0,6697s
0,6527s
0,6522s
0,6523s
0,6530s
Mean = 0,6560s
Conclusion :
When reading a text file of one line, the combination fopen-fget is more efficient than 7% as file_get_contents but when reading a text file of 10 lines, file_get_contents is more efficient than 16% as the combination function fopen-fget.
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Infuance variables in the code:
This test is to see the difference between the definition of several cons a single variable to get the same result.
Code multivariate:
function microtime_float(){
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
$nombre_boucle = 500001;
$time_start = microtime_float();
for($i=0;$i<$nombre_boucle;$i++)
{
$val01 = 5;
$val02 = 3;
$val03 = 6;
$val04 = 2;
$val05 = 9;
$val06 = $val01*$val02;
$val07 = $val06/$val03;
$val08 = $val07^$val05;
$val09 = $val08/$val04;
$val10 = $val09^$val07;
}
$time_end = microtime_float();
$duration_val01 = $time_end - $time_start;
?>
Test code to a variable:
function microtime_float(){
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
$nombre_boucle = 500001;
$time_start = microtime_float();
for($i=0;$i<$nombre_boucle;$i++)
{
$val10 = (((5*3/6)^9)/2)^(5*3/6);
}
$time_end = microtime_float();
$duration_val01 = $time_end - $time_start;
?>
Results for 50000 loops of 5 tests:
Multivariate Testing:
0,2962s
0,2921s
0,2943s
0,2985s
0,2941s
Mean = 0,2950s
Testing a variable:
0,1650s
0,1621s
0,1653s
0,1659s
0,1660s
Mean = 0,1648s
Conclusion :
The test shows a huge loss of performance when using the use of several variables, calculating a value in a single variable is faster than 44%.
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