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run code in 300+ PHP versions simultaneously
<?php var_dump(ZEND_DEBUG_BUILD); var_dump(PHP_DEBUG);
Output for 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, 7.2.29 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
bool(false) int(0)
Output for 5.2.7 - 5.2.17
Notice: Use of undefined constant ZEND_DEBUG_BUILD - assumed 'ZEND_DEBUG_BUILD' in /in/FA7Fk on line 2 string(16) "ZEND_DEBUG_BUILD" int(0)
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 - 5.2.6
Notice: Use of undefined constant ZEND_DEBUG_BUILD - assumed 'ZEND_DEBUG_BUILD' in /in/FA7Fk on line 2 string(16) "ZEND_DEBUG_BUILD" Notice: Use of undefined constant PHP_DEBUG - assumed 'PHP_DEBUG' in /in/FA7Fk on line 3 string(9) "PHP_DEBUG"

preferences:
281.98 ms | 403 KiB | 353 Q