Static-what are the differences between PHP versions earlier than 5.3 and PHP versions later than 5.3 In the static class?

I have contact with PHP versions earlier than version 5.6 and have not contact experts for help. My PHP version 5.3 does not report an error. If I have changed to version 5.6, I began to report an error saying that static classes cannot be used, staticpublicfunction (){....} {code ...} I have contact with PHP versions earlier than version 5.6,

My PHP version 5.3 does not report an error,

If it has been changed to version 5.6, an error is reported that the static class cannot be used. static public function (){....}

**Strict Standards: Non-static method cls_image::gd_version() should not be called statically in F:\WWW\weixin\includes\lib_base.php on line 276Strict Standards: Non-static method cls_image::gd_version() should not be called statically in F:\WWW\weixin\includes\lib_base.php on line 276Deprecated: preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in F:\WWW\weixin\includes\cls_template.php on line 300Strict Standards: Non-static method cls_image::gd_version() should not be called statically in F:\WWW\weixin\includes\lib_base.php on line 276**

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I have contact with PHP versions earlier than version 5.6,

My PHP version 5.3 does not report an error,

If it has been changed to version 5.6, an error is reported that the static class cannot be used. static public function (){....}

**Strict Standards: Non-static method cls_image::gd_version() should not be called statically in F:\WWW\weixin\includes\lib_base.php on line 276Strict Standards: Non-static method cls_image::gd_version() should not be called statically in F:\WWW\weixin\includes\lib_base.php on line 276Deprecated: preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in F:\WWW\weixin\includes\cls_template.php on line 300Strict Standards: Non-static method cls_image::gd_version() should not be called statically in F:\WWW\weixin\includes\lib_base.php on line 276**

Php syntax becomes more standardized and more rigorous, so the code that does not comply with the specifications will be prompted in the past. This is a good thing and you should get used to it.

ecshopOfcls_imageLibrarygd_versionNot a static method

Http://de2.php.net/manual/en/language.oop5.static.php

Calling non-static methods statically generates an E_STRICT level warning.
Calling a non-static method in static mode will result in an E_STRICT error.

Http://us2.php.net/manual/en/errorfunc.constants.php

E_STRICT Enable to have PHP suggest changes to your code which will ensure the best interoperability and forward compatibility of your code. Since PHP 5 but not supported ded in E_ALL until PHP 5.4.0
E_STRICT enables PHP code modification suggestions to ensure the best code interoperability and forward compatibility. PHP 5.4 is enabled by default.