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run code in 300+ PHP versions simultaneously
<?php $w = 'wonderous'; $x = 'a thing of beauty is ' . strtoupper($w); $z = ${'x'}; echo "${z}\n"; echo ${'z'},"\n";
Output for 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Deprecated: Using ${var} in strings is deprecated, use {$var} instead in /in/afPqT on line 5 a thing of beauty is WONDEROUS a thing of beauty is WONDEROUS
Output for 5.5.24 - 5.5.35, 5.6.8 - 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 - 8.1.27
a thing of beauty is WONDEROUS a thing of beauty is WONDEROUS

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