What are the potential issues when migrating from PHP version 5.3 to 5.4 or higher, specifically related to mail functionality?

When migrating from PHP version 5.3 to 5.4 or higher, one potential issue related to mail functionality is the deprecated use of the "safe_mode" directive in PHP.ini. To solve this, you should remove any references to "safe_mode" in your PHP.ini file and update your mail function calls to adhere to the new standards. 

// Before
ini_set('safe_mode', '1');

// After
// Remove any references to 'safe_mode' directive

Keywords

PHP version 5.3 version 5.4 mail functionality migration

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