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<?php $obj = new stdClass(); $obj->bar = "xyz"; $data = array("foo" => "bar"); $key = "foo"; // echo $obj->${data[$key]}; syntax error echo $obj->{$data[$key]}; $member = $data[$key]; echo $obj->${member}; echo $obj->{$member}; echo "${data[$key]}"; // of course, this works echo "{$data[$key]}";
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Deprecated: Using ${var} in strings is deprecated, use {$var} instead in /in/ldZKl on line 13 xyz Fatal error: Uncaught Error: Undefined constant "member" in /in/ldZKl:10 Stack trace: #0 {main} thrown in /in/ldZKl on line 10
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
xyz Fatal error: Uncaught Error: Undefined constant "member" in /in/ldZKl:10 Stack trace: #0 {main} thrown in /in/ldZKl on line 10
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
xyz Warning: Use of undefined constant member - assumed 'member' (this will throw an Error in a future version of PHP) in /in/ldZKl on line 10 xyzxyzbarbar
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20
xyz Notice: Use of undefined constant member - assumed 'member' in /in/ldZKl on line 10 xyzxyzbarbar
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