PHP query memory information operation example

This article describes the operation of querying memory information by php. Share it for your reference, as follows:

PHP query memory information to better view memory usage and better optimize code.

Check the current memory usage:memory_get_usage()function.

Check the memory usage peak:memory_get_peak_usage()function.

<?php
header("Content-Type:text/html;charset=utf-8");
/**
  * Format byte size
  * @param number $size Number of bytes
  * @param string $delimiter Number and unit separator
  * @return string The size of the formatted unit
  */
function format_bytes($size, $delimiter = '') {
  $units = array('B', 'KB', 'MB', 'GB', 'TB', 'PB');
  for ($i = 0; $size >= 1024 && $i < 5; $i++) $size /= 1024;
  return round($size, 2) . $delimiter ." ".$units[$i];
}
echo "Initial Memory Status:".format_bytes(memory_get_usage());
echo "<hr/>";
echo "Start with memory<br/>";
//Use memoryfor($i = 0;$i &lt; 100000;$i++){
  $array[] = md5($i);
}
echo "Memory Status:".format_bytes(memory_get_usage())."&lt;br/&gt;";
echo "Delete half of the memory<br/>";
//Delete half of the memoryfor($i = 0;$i &lt; 100000;$i++){
  unset($array[$i]);
}
echo "Final Memory State:".format_bytes(memory_get_usage());
echo "&lt;hr/&gt;";
echo "Memory Peak Status:".format_bytes(memory_get_peak_usage());

Execution results:

Memory initial state: 65.27 KB
--------------------------------------------------------------------------------
Start using memory
Memory status: 12.01 MB
Delete half of the memory
Final memory state: 577.52 KB
--------------------------------------------------------------------------------
Memory peak state: 12.01 MB

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