Online PHP editor | refs for YvKIn

<?php $its = 1e5; $true = true; $fals = false; $stri = 'string'; $t = hrtime(true); for ( $i = 0; $i++ < $its; ) { if ( $true ); if ( $fals ); if ( $stri ); } echo 'plain : ', $old = ( hrtime(true)-$t ) / 1e9, "s\n"; $t = hrtime(true); for ( $i = 0; $i++ < $its; ) { if ( empty( $true ) ); if ( empty( $fals ) ); if ( empty( $stri ) ); } echo 'empty : ', $old = ( hrtime(true)-$t ) / 1e9, "s\n"; $t = hrtime(true); for ( $i = 0; $i++ < $its; ) { if ( ! $true ); if ( ! $fals ); if ( ! $stri ); } echo 'not : ', $old = ( hrtime(true)-$t ) / 1e9, "s\n"; $t = hrtime(true); for ( $i = 0; $i++ < $its; ) { if ( ! empty( $true ) ); if ( ! empty( $fals ) ); if ( ! empty( $stri ) ); } echo 'notemp: ', $old = ( hrtime(true)-$t ) / 1e9, "s\n"; $t = hrtime(true); for ( $i = 0; $i++ < $its; ) { if ( isset( $true ) ); if ( isset( $fals ) ); if ( isset( $stri ) ); } echo 'isset : ', $old = ( hrtime(true)-$t ) / 1e9, "s\n"; $t = hrtime(true); for ( $i = 0; $i++ < $its; ) { if ( ! isset( $true ) ); if ( ! isset( $fals ) ); if ( ! isset( $stri ) ); } echo 'notiss: ', $old = ( hrtime(true)-$t ) / 1e9, "s\n";