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<?php $array = [ 'foo' => '', '' => 'bar', 17 => 'baz', 'foobar' => 19, 0 => 'barfoo', 'barbaz' => 0, ]; var_dump(array_filter($array)); var_dump(array_filter($array, null)); var_dump(array_filter($array, null, ARRAY_FILTER_USE_KEY)); var_dump(array_filter($array, null, ARRAY_FILTER_USE_BOTH));
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14, 8.5.0
array(4) { [""]=> string(3) "bar" [17]=> string(3) "baz" ["foobar"]=> int(19) [0]=> string(6) "barfoo" } array(4) { [""]=> string(3) "bar" [17]=> string(3) "baz" ["foobar"]=> int(19) [0]=> string(6) "barfoo" } array(4) { [""]=> string(3) "bar" [17]=> string(3) "baz" ["foobar"]=> int(19) [0]=> string(6) "barfoo" } array(4) { [""]=> string(3) "bar" [17]=> string(3) "baz" ["foobar"]=> int(19) [0]=> string(6) "barfoo" }
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.
Output for 8.3.28
/bin/php-8.3.28: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.3.28) /bin/php-8.3.28: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.3.28) /bin/php-8.3.28: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.3.28) /bin/php-8.3.28: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.3.28)
Process exited with code 1.
Output for 7.4.0 - 7.4.33
array(4) { [""]=> string(3) "bar" [17]=> string(3) "baz" ["foobar"]=> int(19) [0]=> string(6) "barfoo" } Warning: array_filter() expects parameter 2 to be a valid callback, no array or string given in /in/Cj17A on line 13 NULL Warning: array_filter() expects parameter 2 to be a valid callback, no array or string given in /in/Cj17A on line 14 NULL Warning: array_filter() expects parameter 2 to be a valid callback, no array or string given in /in/Cj17A on line 15 NULL
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