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<?php function condenseDays(string $days): string { return preg_replace( '/-\K[^,]+-/', '', str_replace( ['n,t', 'e,w', 'd,t', 'u,f', 'i,s', 't,s'], ['n-t', 'e-w', 'd-t', 'u-f', 'i-s', 't-s'], $days ) ); } echo condenseDays('mon,tue,wed,thu,fri,sat') . "\n"; echo condenseDays('tue,thu,fri,sun') . "\n"; echo condenseDays('mon,tue,wed,fri,sat,sun') . "\n"; echo condenseDays('mon,thu,sun') . "\n"; echo condenseDays('tue,wed,fri,sat') . "\n"; echo condenseDays('mon,wed,fri,sun') . "\n"; echo condenseDays('mon,tue,thu,fri,sat,sun');
Output for git.master, git.master_jit, rfc.property-hooks
mon-sat tue,thu-sun mon-wed,fri-sun mon-thu,sun tue-wed,fri-sat mon,wed,fri-sun mon-tue,thu-sun

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