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<?php var_dump( (array)5, (array)null, (array) 0); $tests = [ '[] == false' => [] == false, '"" == false' => "" == false, '"ABC" == false' => "ABC" == false, '"123" == false' => "123" == false, 'null == false' => null == false, '0 == false' => 0 == false, '0.49 == false' => 0.49 == false ]; $i = 1; foreach($tests as $name => $result) { echo ++$i . ") " . $name . ($result ? ' => T' : ' => F') . "\n"; }
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.3.6
array(1) { [0]=> int(5) } array(0) { } array(1) { [0]=> int(0) } 2) [] == false => T 3) "" == false => T 4) "ABC" == false => F 5) "123" == false => F 6) null == false => T 7) 0 == false => T 8) 0.49 == false => F
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/8sEAP on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/8sEAP on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/8sEAP on line 7
Process exited with code 255.

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