Online PHP editor | output for anKE7

Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: 1048576 1967536 1.8763885498047MB
Output for 8.1.0 - 8.1.27: 1048576 1967848 1.8766860961914MB
Output for 8.0.0 - 8.0.30: 1048576 1967384 1.8762435913086MB
Output for 7.4.0 - 7.4.33: 1048576 1967688 1.8765335083008MB
Output for 7.3.12 - 7.3.33: 1048576 1967608 1.8764572143555MB
Output for 7.2.29 - 7.2.33: 1048576 1963760 1.8727874755859MB
Output for 7.2.0 - 7.2.6: 1048576 1963800 1.8728256225586MB
Output for 7.0.0 - 7.0.20, 7.1.0, 7.1.7 - 7.1.20: 1048576 1927192 1.8379135131836MB
Output for 7.1.5 - 7.1.6: 1048576 1927360 1.8380737304688MB
Output for 5.5.0 - 5.5.35, 5.6.0 - 5.6.28: 1048576 1791080 1.7081069946289MB
Output for 5.4.10 - 5.4.45: 1048576 1791544 1.7085494995117MB
Output for 5.4.0 - 5.4.9: 1048576 1791016 1.7080459594727MB
Output for 5.3.11 - 5.3.29: 1048576 2194584 2.0929183959961MB
Output for 5.3.0 - 5.3.10: 1048576 2194280 2.0926284790039MB
Output for 5.2.10 - 5.2.17: 1048576 1651640 1.5751266479492MB
Output for 5.2.7 - 5.2.9: 1048576 1651672 1.5751571655273MB
Output for 5.2.3 - 5.2.6: 1048576 1651992 1.5754623413086MB
Output for 5.2.1 - 5.2.2: 1048576 1649920 1.573486328125MB
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0: 1048576 Fatal error: Call to undefined function memory_get_peak_usage() in /in/anKE7 on line 6 
Process exited with code 255.
Output for 4.4.5 - 4.4.9: 1048576 Fatal error: Call to undefined function: memory_get_peak_usage() in /in/anKE7 on line 6 
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.4: 1048576 Fatal error: Call to undefined function: memory_get_peak_usage() in /in/anKE7 on line 6 
Process exited with code 255.
Output for 4.3.0 - 4.3.1: 1048576 Fatal error: Call to undefined function: memory_get_peak_usage() in /in/anKE7 on line 6