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run code in 150+ php & hhvm versions
Bugs & Features
<?php $MyMondayClasses = $MyTuesdayClasses = $MyWednesdayClasses = $MyThursdayClasses = $MyFridayClasses = range("A", "Z"); $days = array( 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Fridayxxxx' ); foreach ( $days as $value ) { $name = ${sprintf("My%sClasses", $value)}; if (! isset($name)) // add some validation continue; foreach ( $name as $ClassKey => $ClassVar ) { //play some ball } }
Output for 5.0.4 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Undefined variable: MyFridayxxxxClasses in /in/YFjeS on line 13
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: MyFridayxxxxClasses in /in/YFjeS on line 13