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<?php $var = ['someKey' => 'someValue']; echo $var['someKey']; $wasSet = isset($var['aKey']); if ($wasSet) { echo "was set"; } else { echo "was not set"; } $possibleVar = $var['aKey']; if ($possibleVar) { echo "possible var: $possibleVar"; } else { echo "possible var is false: $possibleVar"; } function testIsSet($arg, $key) { if (isset($arg[$key])) { return $arg[$key]; } return "Default value"; } $retrievedValue = testIsSet($var, 'aKey'); echo "\n\nRetrieved value is $retrievedValue\n";
Output for git.master, git.master_jit, rfc.property-hooks
someValuewas not set Warning: Undefined array key "aKey" in /in/rfLbK on line 15 possible var is false: Retrieved value is Default value

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