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run code in 150+ php & hhvm versions
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<?php echo 'sanitize: ', var_export(filter_var('', FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION)); "\n"; echo 'validate: ', var_export(filter_var('', FILTER_VALIDATE_FLOAT));
Output for 5.2.0 - 5.6.28, 7.0.0 - 7.1.0
sanitize: ''validate: false
Output for hhvm-3.12.0
sanitize: ''1validate: false1
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.1.6
sanitize: Fatal error: Call to undefined function filter_var() in /in/bebTe on line 3
Process exited with code 255.
Output for 4.4.5 - 4.4.9
sanitize: Fatal error: Call to undefined function: filter_var() in /in/bebTe on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.4
sanitize: Fatal error: Call to undefined function: filter_var() in /in/bebTe on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
sanitize: Fatal error: Call to undefined function: filter_var() in /in/bebTe on line 3