Page crashed

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Hi, My page, build vith version 5.4.21, has crashed, because my webhosting firm has upgraded their server. Now they say that the page does not correspond to the php version on the server. Which php version should I use to Concrete5 ver. 5.4.21? The lowest version on the server are php4. Could there be any reason why the page is only showing lots af codes and some pictures?

 
rvdbedum replied on at Permalink Reply
Were running several versions of concrete5 on PHP 5.6, with no problems. You can try to enable error reporting and see what causes the issues.

I wouldn't suggest to use PHP4. it is an older version that contains several vulnerabilities.