gc_test.php

<?php
ini_set('xdebug.trace_format', '1');
class MyPhotoBO {
    public static $SPEC_GIANT = "giant";
    public static $SPEC_BIG = "big";
    public static $SPEC_MIDDLE = "middle";
    public static $SPEC_MIDDLE_BIG = "middlebig";
    public static $SPEC_SQUARE_200 = "middlesquare";
    public static $SPEC_SQUARE_100 = "smallsquare";
    public static $SPEC_FIT_100 = "smallfit";
    public static $SPEC_MIDDLE_PRODUCT = "middleproduct";
    public static $SPEC_SQUARE_49 = "smallheadsquare";
    public static $SPEC_NEW_BIG = "newbig";
    public static $SPEC_FIT_210 = "fit210";

    public static $MR_SPEC_BIG = 'mr_spec_big';
    public static $MR_SPEC_MIDDLE = 'mr_spec_middle';
    public static $MR_SPEC_SQUARE_200 = 'mr_square_200';
    public static $MR_SPEC_SQUARE_100 = 'mr_square_100';
    public static $MR_SPEC_FIT_100 = 'mr_fit_100';
    public static $MR_SPEC_NEW_BIG  = 'mr_spec_new_big';

    public static function getSpecMap () {
        return array (
            self::$SPEC_BIG => array(0, 1280, 1280, '_b', 80, 1, 0),
            self::$SPEC_MIDDLE_BIG => array(0, 640, 640, '_mb', 90, 2, 0),
            self::$SPEC_MIDDLE => array(0, 480, 480, '_m', 90, 2, 0),
            self::$SPEC_SQUARE_200 => array(1, 200, 200, '_sm', 95, 3, 1),
            self::$SPEC_SQUARE_100 => array(1, 100, 100, '_ss', 100, 4, 1),
            self::$SPEC_FIT_100 => array(0, 100, 100, '_sf', 100, 2, 1),
            self::$SPEC_SQUARE_49 => array(1, 49, 49, '_hs', 100, 5, 1),
            self::$SPEC_NEW_BIG => array(0, 960, 960, '_nb', 90, 2, 0),
        );
    }

}


class ConstMyPhotoBO {
    const SPEC_GIANT = "giant";
    const SPEC_BIG = "big";
    const SPEC_MIDDLE = "middle";
    const SPEC_MIDDLE_BIG = "middlebig";
    const SPEC_SQUARE_200 = "middlesquare";
    const SPEC_SQUARE_100 = "smallsquare";
    const SPEC_FIT_100 = "smallfit";
    const SPEC_MIDDLE_PRODUCT = "middleproduct";
    const SPEC_SQUARE_49 = "smallheadsquare";
    const SPEC_NEW_BIG = "newbig";
    const SPEC_FIT_210 = "fit210";

    const MR_SPEC_BIG = 'mr_spec_big';
    const MR_SPEC_MIDDLE = 'mr_spec_middle';
    const MR_SPEC_SQUARE_200 = 'mr_square_200';
    const MR_SPEC_SQUARE_100 = 'mr_square_100';
    const MR_SPEC_FIT_100 = 'mr_fit_100';
    const MR_SPEC_NEW_BIG  = 'mr_spec_new_big';

    public static $spec_map = array(
        self::SPEC_BIG => array(0, 1280, 1280, '_b', 80, 1, 0),
        self::SPEC_MIDDLE_BIG => array(0, 640, 640, '_mb', 90, 2, 0),
        self::SPEC_MIDDLE => array(0, 480, 480, '_m', 90, 2, 0),
        self::SPEC_SQUARE_200 => array(1, 200, 200, '_sm', 95, 3, 1),
        self::SPEC_SQUARE_100 => array(1, 100, 100, '_ss', 100, 4, 1),
        self::SPEC_FIT_100 => array(0, 100, 100, '_sf', 100, 2, 1),
        self::SPEC_SQUARE_49 => array(1, 49, 49, '_hs', 100, 5, 1),
        self::SPEC_NEW_BIG => array(0, 960, 960, '_nb', 90, 2, 0),


    );

    public static function getSpecMap () {
        return self::$spec_map;
    }
}


$max_time = 100000;


for ($i = 0; $i < $max_time; $i++) {
    $spec_map = MyPhotoBO::getSpecMap();
    $const_spec_map = ConstMyPhotoBO::getSpecMap();
}

php -d xdebug.auto_trace=1 gc_test.php 可以发现ConstMyPhotoBO的getSpecMap的内存消耗极少，基本上是没有，但是MyPhotoBO::getSpecMap(),消耗极大，每次都会生成新的。