PHPでのメモリの使用量

memory_get_usage

http://php.net/manual/ja/function.memory-get-usage.php

memory_get_peak_usage

http://php.net/manual/ja/function.memory-get-peak-usage.php

例

 echo "MEMORY0 : " . number_format(memory_get_usage()) . " byte（初期値）<br>";
 
 $strBuffer = str_repeat("ABCDEFG,", 10000);
 echo "MEMORY1 : " . number_format(memory_get_usage()) . " byte（文字列生成）<br>";
 
 $aryBuffer = explode(",", $strBuffer);
 echo "MEMORY2 : " . number_format(memory_get_usage()) . " byte（配列生成）<br>";
 
 unset($strBuffer);
 echo "MEMORY3 : " . number_format(memory_get_usage()) . " byte（文字列解放）<br>";
 
 mb_convert_variables("SJIS-win", "UTF-8", $aryBuffer);
 echo "MEMORY4 : " . number_format(memory_get_usage()) . " byte（mb_convert_variables実行）<br>";
 
 unset($aryBuffer);
 echo "MEMORY5 : " . number_format(memory_get_usage()) . " byte（配列解放）<br>";