Online PHP editor | output for KlRKO

@ 2022-08-30T05:29:56Z

<?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 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: mon-sat tue,thu-sun mon-wed,fri-sun mon-thu,sun tue-wed,fri-sat mon,wed,fri-sun mon-tue,thu-sun
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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