Allowed memory size of 8388608 bytes exhausted

1、wampserver配置完以后，一般php.ini中默认的虚拟内存memory_limit=8M，但往往我们在配置一些框架或者开源产品时，在运行一些实例时，往往会报出错误，错误信息如下：

 Allowed memory size of 8388608 bytes exhausted (tried to allocate 24576 bytes)

如果需要解决这个问题，我们需要在PHP的配置文件php.ini去改变一些参数，memory_limit，把这个参数的值改的大一些就可以。但当你的PHP的配置文件不能直接修改的时候，我们需要在你的程序中去临时改变你的虚拟内存，比如说改成100M，int_set('memory_limit', '100M');

2、配置vhosts后，也会出现一些报错，譬如：

wampserver Forbidden You don't have permission to access / on this server.

报403，Forbidden，这往往需要在Apache中去修改参数来解决问题：Deny from all需要改为Allow from all，共需要改两处：

一处在：

<Directory />
    Options FollowSymLinks
    AllowOverride None
    Order deny,allow
    #Deny from all  修改为Allow
    Allow from all
    Satisfy all
</Directory>

另一处是：

<Directory "F:/wamp/www">
    #
    # Possible values for the Options directive are "None", "All",
    # or any combination of:
    #   Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews
    #
    # Note that "MultiViews" must be named *explicitly* --- "Options All"
    # doesn't give it to you.
    #
    # The Options directive is both complicated and important.  Please see
    # http://httpd.apache.org/docs/2.2/mod/core.html#options
    # for more information.
    #
    Options Indexes FollowSymLinks
    #
    # AllowOverride controls what directives may be placed in .htaccess files.
    # It can be "All", "None", or any combination of the keywords:
    #   Options FileInfo AuthConfig Limit
    #
    AllowOverride all
    #
    # Controls who can get stuff from this server.
    #
#   onlineoffline tag - don't remove
    Order Deny,Allow
    #Deny from all 把Deny from all与Allow from 127.0.0.1修改为Allow from all
    Allow from all
    #Allow from 127.0.0.1
</Directory>

以上两个问题修改完成以后，均需要重启Apache，以便修改的配置文件立即生效。