Online PHP editor | refs for qOT1t

<?php file_put_contents("/tmp/testfile", "testcontent"); function mylock() { $F1 = fopen("/tmp/testfile","r"); if (flock($F1,LOCK_EX|LOCK_NB)) echo "First lock OK\n"; else echo "First lock FAIL\n"; $F2 = fopen("/tmp/testfile","r"); if (flock($F2,LOCK_EX|LOCK_NB)) echo "Second lock OK\n"; else echo "Second lock FAIL\n"; } mylock(); echo "Function returned.\n"; mylock(); unlink("/tmp/testfile");