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<?php function halfer(string $string): array { $result = []; $result['explode2'] = explode("\n", $string, 2); $result['preg_split2'] = preg_split("~\R+~", $string, 2, PREG_SPLIT_NO_EMPTY); $newlinePosition = strpos($string,"\n"); $result['substrs'] = [substr($string, 0, $newlinePosition), substr($string, $newlinePosition)]; $result['nlP'] = preg_split("~\n~" ,$string, $newlinePosition); return $result; } $strings = [ 'two newlines' => "1st line\n2nd line\n3rd line", 'leading newline' => "\n1st line\n2nd line\n3rd line", 'lone trailing newline' => "1st line\n", 'no newlines' => "1st line", 'double newlines' => "1st line\n\n2nd line", '\r\n' => "1st\r\n2nd", ]; foreach ($strings as $label => $string) { echo "$label\n"; echo json_encode(halfer($string), JSON_PRETTY_PRINT); echo "\n---\n"; }
Output for git.master, git.master_jit, rfc.property-hooks
two newlines { "explode2": [ "1st line", "2nd line\n3rd line" ], "preg_split2": [ "1st line", "2nd line\n3rd line" ], "substrs": [ "1st line", "\n2nd line\n3rd line" ], "nlP": [ "1st line", "2nd line", "3rd line" ] } --- leading newline { "explode2": [ "", "1st line\n2nd line\n3rd line" ], "preg_split2": [ "1st line", "2nd line\n3rd line" ], "substrs": [ "", "\n1st line\n2nd line\n3rd line" ], "nlP": [ "", "1st line", "2nd line", "3rd line" ] } --- lone trailing newline { "explode2": [ "1st line", "" ], "preg_split2": [ "1st line" ], "substrs": [ "1st line", "\n" ], "nlP": [ "1st line", "" ] } --- no newlines { "explode2": [ "1st line" ], "preg_split2": [ "1st line" ], "substrs": [ "", "1st line" ], "nlP": [ "1st line" ] } --- double newlines { "explode2": [ "1st line", "\n2nd line" ], "preg_split2": [ "1st line", "2nd line" ], "substrs": [ "1st line", "\n\n2nd line" ], "nlP": [ "1st line", "", "2nd line" ] } --- \r\n { "explode2": [ "1st\r", "2nd" ], "preg_split2": [ "1st", "2nd" ], "substrs": [ "1st\r", "\n2nd" ], "nlP": [ "1st\r", "2nd" ] } ---

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