3v4l.org

run code in 300+ PHP versions simultaneously
<?php $param_names = array( 'keyword', 'target_form_name', 'target_category_select_name', 'target_item_select_name', 'book_id' ); $c = 0; foreach( $param_names as $name ) { ${$name} = ++$c; } foreach( $param_names as $name ) { echo $$name . "\n"; }
Output for 5.6.0 - 5.6.24, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
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preferences:
191.5 ms | 403 KiB | 199 Q