Aprenda Profiling Memory Usage | Memory Profiling and Optimization

Understanding how much memory your PHP script consumes is essential for writing efficient and scalable applications. Memory profiling in PHP allows you to monitor and analyze the amount of memory used by your scripts at different points during execution. PHP provides built-in functions like memory_get_usage and memory_get_peak_usage to help you track current and peak memory consumption, respectively. By using these functions, you can identify code areas that use excessive memory and optimize them to prevent performance bottlenecks or out-of-memory errors.

memory_profiling_example.php


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<?php
// Display initial memory usage
echo "Initial memory usage: " . memory_get_usage() . " bytes\n";
echo "Initial peak memory usage: " . memory_get_peak_usage() . " bytes\n";

// Create a large array to increase memory usage
$array = [];
for ($i = 0; $i < 100000; $i++) {
    $array[] = $i;
}

// Display memory usage after array allocation
echo "Memory usage after array allocation: " . memory_get_usage() . " bytes\n";
echo "Peak memory usage after array allocation: " . memory_get_peak_usage() . " bytes\n";

// Unset the array to free memory
unset($array);

// Display memory usage after unsetting the array
echo "Memory usage after unsetting array: " . memory_get_usage() . " bytes\n";
echo "Peak memory usage after unsetting array: " . memory_get_peak_usage() . " bytes\n";

// Comments:
// - memory_get_usage() shows the current memory allocated to the script.
// - memory_get_peak_usage() shows the highest amount of memory allocated at any point.
// - Allocating a large array increases both current and peak memory usage.
// - Unsetting the array reduces current memory usage, but peak memory usage remains unchanged.
?>

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memory_profiling_example.php


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<?php
// Display initial memory usage
echo "Initial memory usage: " . memory_get_usage() . " bytes\n";
echo "Initial peak memory usage: " . memory_get_peak_usage() . " bytes\n";

// Create a large array to increase memory usage
$array = [];
for ($i = 0; $i < 100000; $i++) {
    $array[] = $i;
}

// Display memory usage after array allocation
echo "Memory usage after array allocation: " . memory_get_usage() . " bytes\n";
echo "Peak memory usage after array allocation: " . memory_get_peak_usage() . " bytes\n";

// Unset the array to free memory
unset($array);

// Display memory usage after unsetting the array
echo "Memory usage after unsetting array: " . memory_get_usage() . " bytes\n";
echo "Peak memory usage after unsetting array: " . memory_get_peak_usage() . " bytes\n";

// Comments:
// - memory_get_usage() shows the current memory allocated to the script.
// - memory_get_peak_usage() shows the highest amount of memory allocated at any point.
// - Allocating a large array increases both current and peak memory usage.
// - Unsetting the array reduces current memory usage, but peak memory usage remains unchanged.
?>

Tudo estava claro?

Obrigado pelo seu feedback!

Seção 3. Capítulo 1