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<?php $dates = ['2011-04-11', '2011-06-28', '2011-09-26', '2012-01-02', '2012-05-12']; $startdates = [ 10 => '2011-01-01', 20 => '2011-07-01', 30 => '2012-01-01', 40 => '2012-07-01' ]; $enddates = [ 10 => '2011-06-30', 20 => '2011-12-31', 30 => '2012-06-30', 40 => '2012-12-31' ]; foreach ($dates as $date) { foreach ($startdates as $key => $startdate) { if ($date >= $startdate && $date <= $enddates[$key]) { $result[$date] = $key; continue 2; } } $result[$date] = 'out of bounds'; } var_export($result);
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 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 - 8.5.1
array ( '2011-04-11' => 10, '2011-06-28' => 10, '2011-09-26' => 20, '2012-01-02' => 30, '2012-05-12' => 30, )
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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