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<?php // https://bugs.php.net/bug.php?id=62043 $var1 = null; $var2 = null; $var3 = $var1 ?: $var2; //$var3==null $var4 = $var1 ?: 'default1'; //$var4=='default1' $var5 = $var1 ?: $var2 ?: 'default2'; //$var5=='default2' $var6 = $var2 ?: $var3 ?: $var4 ?: 'default3'; //$var6=='default1' since the first non-null value is $var4=='default1' var_dump($var1, $var2, $var3, $var4, $var5, $var6);
Output for git.master, git.master_jit, rfc.property-hooks
NULL NULL NULL string(8) "default1" string(8) "default2" string(8) "default1"

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