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<?php $values = array( 'string_empty' => '', 'string_bool_f' => 'false', 'string_bool_t' => 'true', 'int_0' => 0, 'int_1' => 1, 'int_neg' => -100, 'int_norm' => 100, 'array_empty' => [], 'array_null_val' => [null], ); foreach ($values as $name => $val) { $is_empty = empty($val) ? 'is' : 'isn\'t'; echo "$name $is_empty considered empty.".PHP_EOL; }
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
string_empty is considered empty. string_bool_f isn't considered empty. string_bool_t isn't considered empty. int_0 is considered empty. int_1 isn't considered empty. int_neg isn't considered empty. int_norm isn't considered empty. array_empty is considered empty. array_null_val isn't considered empty.
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/geFbF on line 11
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/geFbF on line 11
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/geFbF on line 11
Process exited with code 255.
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329.39 ms | 401 KiB | 460 Q