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Cálculo de los números primos que hay hasta un entero n
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Cálculo de los números primos que hay hasta un número n</title> | |
| </head> | |
| <body> | |
| <?php | |
| $inicio = microtime(true); | |
| $numero = 0; | |
| $divisor = 0; | |
| $n = 100000; | |
| $esPrimo = 0; | |
| for ($numero=2; $numero<=$n; $numero++) { | |
| $esPrimo=1; | |
| for ($divisor=2; $divisor<=sqrt($numero); $divisor++) { | |
| if ($numero%$divisor==0) { | |
| $esPrimo=0; | |
| break; | |
| } | |
| } | |
| //if($esPrimo==1) echo $numero."<br>"; | |
| } | |
| $tiempo = microtime(true) - $inicio; | |
| echo 'fin'; | |
| echo "<br>".'Tiempo Total: ' . $tiempo . ' segundos.'; | |
| ?> | |
| </body> | |
| </html> |
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Código usado en mi Blog gutoccs.wordpress.com para el artículo Comparando el rendimiento de 3 versiones de PHP.