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<?php $great = 'abc'; ${'great '} = 'def'; const great = 'ghi'; $ghi = '...'; ${"ෝ"} = 'Meh'; // ${\u{ddd}} = 'Meh'; var_dump("${great }"); // outputs the constant value's variable value var_dump("${'great '}"); // outputs the ${'great '} variable value var_dump("${great}"); // outputs the $great variable value var_dump("${'ෝ'}"); // outputs the ${\u{ddd}} variable value var_dump("${ෝ}"); // outputs the ${\u{ddd}} variable value /* Even though "great " is not a valid variable name, neither is "\u{ddd}" but that still works. I'd therefore expect "${great }" to firstly search for a variable named "great " before falling back to evaluating the expression first. */
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in /in/fC2vh on line 9 Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in /in/fC2vh on line 10 Deprecated: Using ${var} in strings is deprecated, use {$var} instead in /in/fC2vh on line 11 Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in /in/fC2vh on line 12 Deprecated: Using ${var} in strings is deprecated, use {$var} instead in /in/fC2vh on line 13 string(3) "..." string(3) "def" string(3) "abc" string(3) "Meh" string(3) "Meh"
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in /in/fC2vh on line 9 Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in /in/fC2vh on line 10 Deprecated: Using ${var} in strings is deprecated, use {$var} instead in /in/fC2vh on line 11 Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in /in/fC2vh on line 12 Deprecated: Using ${var} in strings is deprecated, use {$var} instead in /in/fC2vh on line 13 string(3) "..." string(3) "def" string(3) "abc" string(3) "Meh" string(3) "Meh"
Output for 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
string(3) "..." string(3) "def" string(3) "abc" string(3) "Meh" string(3) "Meh"
preferences:
234.54 ms | 403 KiB | 258 Q