benchmark-generator.php

<?php
$iterations = 1000000;

echo <<<PHP
<?php
\$iterations = $iterations;
\$style = 'default';

PHP;

// -----------------------------------------------------------------------------
// Benchmark direct output
// -----------------------------------------------------------------------------

echo <<<'PHP'

// -----------------------------------------------------------------------------
// Benchmark direct output
// -----------------------------------------------------------------------------

$start = microtime(true);
?>

PHP;

for ($i=0; $i<$iterations; $i++) {
    echo <<<PHP
<input class="input$i" />

PHP;
}

echo <<<'PHP'
<?php
$end = microtime(true);
$time1 = $end - $start;
$format = <<<'OUT'
Execution time without array access: %f sec
Memory peak usage: %d bytes


OUT;
$output = sprintf($format, $time1, memory_get_peak_usage());
fwrite(STDERR, $output);

PHP;

// -----------------------------------------------------------------------------
// Benchmark array access output
// -----------------------------------------------------------------------------

echo <<<'PHP'

// -----------------------------------------------------------------------------
// Benchmark array access output
// -----------------------------------------------------------------------------

$GLOBALS['TL_CSS_SETS'] = [
    'default' => [
PHP;

for ($i=0; $i<$iterations; $i++) {
    echo <<<PHP
        '.input$i' => 'input$i',

PHP;
}

echo <<<'PHP'
    ]
];

$start = microtime(true);
?>

PHP;

for ($i=0; $i<$iterations; $i++) {
    echo <<<PHP
<input class="<?= \$GLOBALS['TL_CSS_SETS'][\$style]['.input$i'] ?>" />

PHP;
}

echo <<<'PHP'
<?php
$end = microtime(true);
$time2 = $end - $start;
$format = <<<'OUT'
Execution time with array access: %f sec
Memory peak usage: %d bytes


OUT;
$output = sprintf($format, $time2, memory_get_peak_usage());
fwrite(STDERR, $output);

PHP;

// -----------------------------------------------------------------------------
// Benchmark convenience method access output
// -----------------------------------------------------------------------------

echo <<<'PHP'

// -----------------------------------------------------------------------------
// Benchmark convenience method access output
// -----------------------------------------------------------------------------

class CssClass
{
    public static function get($class, $style = null)
    {
        if (!$style) {
            $style = $GLOBALS['style'];
        }
        return $GLOBALS['TL_CSS_SETS'][$style][$class];
    }
}

$start = microtime(true);
?>

PHP;

for ($i=0; $i<$iterations; $i++) {
    echo <<<PHP
<input class="<?= CssClass::get('.input$i') ?>" />

PHP;
}

echo <<<'PHP'
<?php
$end = microtime(true);
$time3 = $end - $start;
$format = <<<'OUT'
Execution time with convenience method: %f sec
Memory peak usage: %d bytes

OUT;
$output = sprintf($format, $time3, memory_get_peak_usage());
fwrite(STDERR, $output);

PHP;


echo <<<'PHP'

// -----------------------------------------------------------------------------
// Calculate impact and output results
// -----------------------------------------------------------------------------

$impact1 = $time2 - $time1;
$impact2 = $time3 - $time2;
$format = <<<'OUT'
Iterations / Classes: %d

*** Array access ***
Total impact: %f sec
Impact per class: %f sec

*** Convenience method ***
Total impact: %f sec
Impact per class: %f sec

OUT;
$output = sprintf($format, $iterations, $impact1, $impact1 / $iterations, $impact2, $impact2 / $iterations);
fwrite(STDERR, $output);

PHP;

benchmark.php

/* ***************************************************
 *
 *             !!! Shortened example !!!
 *
 * The generated benchmark.php is about 190MB in size!
 *
 * ***************************************************
<?php
$iterations = 10;
$style = 'default';

// -----------------------------------------------------------------------------
// Benchmark direct output
// -----------------------------------------------------------------------------

$start = microtime(true);
?>
<input class="input0" />
<input class="input1" />
<input class="input2" />
<input class="input3" />
<input class="input4" />
<input class="input5" />
<input class="input6" />
<input class="input7" />
<input class="input8" />
<input class="input9" />
...
<?php
$end = microtime(true);
$time1 = $end - $start;
$format = <<<'OUT'
Execution time without array access: %f sec
Memory peak usage: %d bytes


OUT;
$output = sprintf($format, $time1, memory_get_peak_usage());
fwrite(STDERR, $output);

// -----------------------------------------------------------------------------
// Benchmark array access output
// -----------------------------------------------------------------------------

$GLOBALS['TL_CSS_SETS'] = [
    'default' => [        '.input0' => 'input0',
        '.input1' => 'input1',
        '.input2' => 'input2',
        '.input3' => 'input3',
        '.input4' => 'input4',
        '.input5' => 'input5',
        '.input6' => 'input6',
        '.input7' => 'input7',
        '.input8' => 'input8',
        '.input9' => 'input9',
        ...
    ]
];

$start = microtime(true);
?>
<input class="<?= $GLOBALS['TL_CSS_SETS'][$style]['.input0'] ?>" />
<input class="<?= $GLOBALS['TL_CSS_SETS'][$style]['.input1'] ?>" />
<input class="<?= $GLOBALS['TL_CSS_SETS'][$style]['.input2'] ?>" />
<input class="<?= $GLOBALS['TL_CSS_SETS'][$style]['.input3'] ?>" />
<input class="<?= $GLOBALS['TL_CSS_SETS'][$style]['.input4'] ?>" />
<input class="<?= $GLOBALS['TL_CSS_SETS'][$style]['.input5'] ?>" />
<input class="<?= $GLOBALS['TL_CSS_SETS'][$style]['.input6'] ?>" />
<input class="<?= $GLOBALS['TL_CSS_SETS'][$style]['.input7'] ?>" />
<input class="<?= $GLOBALS['TL_CSS_SETS'][$style]['.input8'] ?>" />
<input class="<?= $GLOBALS['TL_CSS_SETS'][$style]['.input9'] ?>" />
...
<?php
$end = microtime(true);
$time2 = $end - $start;
$format = <<<'OUT'
Execution time with array access: %f sec
Memory peak usage: %d bytes


OUT;
$output = sprintf($format, $time2, memory_get_peak_usage());
fwrite(STDERR, $output);

// -----------------------------------------------------------------------------
// Benchmark convenience method access output
// -----------------------------------------------------------------------------

class CssClass
{
    public static function get($class, $style = null)
    {
        if (!$style) {
            $style = $GLOBALS['style'];
        }
        return $GLOBALS['TL_CSS_SETS'][$style][$class];
    }
}

$start = microtime(true);
?>
<input class="<?= CssClass::get('.input0') ?>" />
<input class="<?= CssClass::get('.input1') ?>" />
<input class="<?= CssClass::get('.input2') ?>" />
<input class="<?= CssClass::get('.input3') ?>" />
<input class="<?= CssClass::get('.input4') ?>" />
<input class="<?= CssClass::get('.input5') ?>" />
<input class="<?= CssClass::get('.input6') ?>" />
<input class="<?= CssClass::get('.input7') ?>" />
<input class="<?= CssClass::get('.input8') ?>" />
<input class="<?= CssClass::get('.input9') ?>" />
...
<?php
$end = microtime(true);
$time3 = $end - $start;
$format = <<<'OUT'
Execution time with convenience method: %f sec
Memory peak usage: %d bytes

OUT;
$output = sprintf($format, $time3, memory_get_peak_usage());
fwrite(STDERR, $output);

// -----------------------------------------------------------------------------
// Calculate impact and output results
// -----------------------------------------------------------------------------

$impact1 = $time2 - $time1;
$impact2 = $time3 - $time2;
$format = <<<'OUT'
Iterations / Classes: %d

*** Array access ***
Total impact: %f sec
Impact per class: %f sec

*** Convenience method ***
Total impact: %f sec
Impact per class: %f sec

OUT;
$output = sprintf($format, $iterations, $impact1, $impact1 / $iterations, $impact2, $impact2 / $iterations);
fwrite(STDERR, $output);

output.txt

$ php generate.php > benchmark.php
$ php benchmark.php > /dev/null
Execution time without array access: 0.000018 sec
Memory peak usage: 4002872112 bytes

Execution time with array access: 0.726445 sec
Memory peak usage: 4002872112 bytes

Execution time with convenience method: 1.946270 sec
Memory peak usage: 4002872112 bytes
Iterations / Classes: 1000000

*** Array access ***
Total impact: 0.726427 sec
Impact per class: 0.000001 sec

*** Convenience method ***
Total impact: 1.219825 sec
Impact per class: 0.000001 sec