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run code in 150+ php & hhvm versions
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<?php $line = 'MemTotal: 1027156 kB'; var_dump( sscanf($line, '%s%d') );
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> string(9) "MemTotal:" [1]=> int(1027156) }