PHP 5.x 에서 PHP 7으로 업그레이드시 작업

PHP 5.x 에서 PHP 7으로 Migration(Upgrade) 작업해야 할 사항들.

PHP 7이 속도 향상의 크게 영향을 주기에, 사이트에 소스 Upgrade도 한번 쯤 생각하게 만듭니다.

해당 부분은 PHP7으로 업그레이드 할때, 변경해야 하는 사항들 메뉴얼에 나온 부분들 입니다.

Migrating from PHP 5.6.x to PHP 7.0.x

http://php.net/manual/en/migration70.php

Migrating from PHP 5.6.x to PHP 7.0.x ¶

Table of Contents ¶

• Backward incompatible changes
• New features
• Deprecated features in PHP 7.0.x
• Changed functions
• New functions
• New Classes and Interfaces
• New Global Constants
• Changes in SAPI Modules
• Removed Extensions and SAPIs
• Other Changes

Changed functions 

http://php.net/manual/en/migration70.changed-functions.php

PHP Core ¶

• debug_zval_dump() now prints "int" instead of "long", and "float" instead of "double"
• dirname() now optionally takes a second parameter, depth, to get the name of the directory depth levels up from the current directory.
• getrusage() is now supported on Windows.
• mktime() and gmmktime() functions no longer accept is_dst parameter.
• preg_replace() function no longer supports "\e" (PREG_REPLACE_EVAL). preg_replace_callback() should be used instead.
• setlocale() function no longer accepts category passed as string. LC_* constants must be used instead.
• exec(), system() and passthru() functions have NULL byte protection now.
• shmop_open() now returns a resource instead of an int, which has to be passed to shmop_size(),shmop_write(), shmop_read(), shmop_close() and shmop_delete().
• substr() and iconv_substr() now return an empty string, if string is equal to start characters long.
• xml_set_object() now requires to manually unset the $parser when finished, to avoid memory leaks.