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<?php function flat_map(callable $callback, array $collection) { return array_merge([], ...array_map($callback, $collection)); }; var_dump( array_map(function ($el) { return str_split($el); }, ["two birds", "three green peas"]) ); var_dump( flat_map(function ($el) { return str_split($el); }, ["two birds", "three green peas"]) ); var_dump( flat_map(function ($el) { return str_split($el); }, []) );
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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
array(2) { [0]=> array(9) { [0]=> string(1) "t" [1]=> string(1) "w" [2]=> string(1) "o" [3]=> string(1) " " [4]=> string(1) "b" [5]=> string(1) "i" [6]=> string(1) "r" [7]=> string(1) "d" [8]=> string(1) "s" } [1]=> array(16) { [0]=> string(1) "t" [1]=> string(1) "h" [2]=> string(1) "r" [3]=> string(1) "e" [4]=> string(1) "e" [5]=> string(1) " " [6]=> string(1) "g" [7]=> string(1) "r" [8]=> string(1) "e" [9]=> string(1) "e" [10]=> string(1) "n" [11]=> string(1) " " [12]=> string(1) "p" [13]=> string(1) "e" [14]=> string(1) "a" [15]=> string(1) "s" } } array(25) { [0]=> string(1) "t" [1]=> string(1) "w" [2]=> string(1) "o" [3]=> string(1) " " [4]=> string(1) "b" [5]=> string(1) "i" [6]=> string(1) "r" [7]=> string(1) "d" [8]=> string(1) "s" [9]=> string(1) "t" [10]=> string(1) "h" [11]=> string(1) "r" [12]=> string(1) "e" [13]=> string(1) "e" [14]=> string(1) " " [15]=> string(1) "g" [16]=> string(1) "r" [17]=> string(1) "e" [18]=> string(1) "e" [19]=> string(1) "n" [20]=> string(1) " " [21]=> string(1) "p" [22]=> string(1) "e" [23]=> string(1) "a" [24]=> string(1) "s" } array(0) { }
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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