Data update

Task/Abbreviations-automatic/PHP/abbreviations-automatic.php

@@ -0,0 +1,18 @@
+function genMinAbbr(array $days): array {
+    $len = 0;
+    while(true) {
+    	$dict = [];
+    	$len++;
+        foreach($days as $day) {
+        	$abbr = substr($day, 0, $len);
+        	if (isset($dict[$abbr])) continue 2;
+        	$dict[$abbr] = true;
+        }
+        return array_keys($dict);
+    }
+}
+
+foreach(explode("\n", file_get_contents("days-of-the-week.txt")) as $line) {
+    if (!$line) { echo "\n"; continue; }
+    echo implode(" ", genMinAbbr(explode(" ", $line))) . "\n";
+}