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<?php $list = ['item1','item2','item3','item4','item5','item6']; var_export( array_map(fn($row) => array_merge([999999], $row), array_chunk($list, 2)) );
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 - 8.5.1
array ( 0 => array ( 0 => 999999, 1 => 'item1', 2 => 'item2', ), 1 => array ( 0 => 999999, 1 => 'item3', 2 => 'item4', ), 2 => array ( 0 => 999999, 1 => 'item5', 2 => 'item6', ), )
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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