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run code in 200+ php & hhvm versions
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<?php $var = ''; for ( $i = 0; $i = 1000; $i++ ) { if ( is_string( $var ) && ! empty( $var ) ) { } } for ( $i = 0; $i = 1000; $i++ ) { if ( ! empty( $var ) && is_string( $var ) ) { } }
Output for 5.3.13 - 7.2.0

Process exited with code 137.