CodeIgniter 2.X to PHP5.6 compatible error

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CI 3.0 is compatible with this issue

A PHP version compatibility error was encountered during code migration

A PHP Error was encounteredSeverity: NoticeMessage: Only variable references should be returned by referenceFilename: core/Common.phpLine Number: 257

The original server PHP version is 5.4, the new server PHP version is 5.6, CodeIgniter version 2.1.3

Solution online More, in this record, make a note.

main reason: This error mainly occurs in CodeIgniter 2.x using PHP 5.6 or more versions

Workaround:

1. Demote PHP version to 5.5 or less

2. Modify/system/core/common.php line No. 257 code

Will:

return $_config[0] =& $config;

Change to:

$_config[0] =& $config; return $_config[0];

CodeIgniter 2.X to PHP5.6 compatible error