<?php function grep($pattern) { echo "Looking for $pattern\n"; while (true) { $line = (yield); if (false !== strpos($line, $pattern)) { echo "$line\n"; } } } // Imagine we parsed a file which returned the following lines. $lines = array( "<?php\n", "echo 'toto';", ); $g = grep('php'); $g->next(); foreach ($lines as $line) { $g->send($line); }
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