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<?php error_reporting(E_ALL); function f($x) { return $x; } $x = 'variable'; const x = 'const'; echo "${f(x)}";
Output for 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in /in/jHHLP on line 11 Warning: Undefined variable $const in /in/jHHLP on line 11
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33
Warning: Undefined variable $const in /in/jHHLP on line 11
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Notice: Undefined variable: const in /in/jHHLP on line 11
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45
Parse error: syntax error, unexpected '(' in /in/jHHLP on line 11
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_CONST in /in/jHHLP on line 10
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 T_CONST in /in/jHHLP on line 10
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/jHHLP on line 10
Process exited with code 255.

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