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<?php $a = ['baz' => 7]; $b = (string) $a['foo'] ?? 'bar'; $c = (string) $a['baz'] ?? 'some thing else'; $d = (string) ($a['foo'] ?? 'bar'); var_dump($b, $c, $d);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
Warning: Undefined array key "foo" in /in/WogF7 on line 6 string(0) "" string(1) "7" string(3) "bar"
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.5 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined index: foo in /in/WogF7 on line 6 string(0) "" string(1) "7" string(3) "bar"
Output for 7.3.32 - 7.3.33
string(0) "" string(1) "7" string(3) "bar"
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/WogF7 on line 6
Process exited with code 255.
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