effone · January 4, 2022 13:58 · Aug 18, 2018 · Aug 18, 2018
diff --git a/func.abb.php b/func.abb.php
@@ -1,3 +1,5 @@
+<?php
+
 /**
  * Generate 3-letter abbreviation
  * @author effone <[email protected]>

diff --git a/func.abb.php b/func.abb.php
@@ -0,0 +1,33 @@
+/**
+ * Generate 3-letter abbreviation
+ * @author effone <[email protected]>
+ * 
+ * @param string $string
+ * @return string
+ */
+function abb($string = '')
+{
+    $vowels = array('A', 'E', 'I', 'O', 'U');
+    $string = preg_replace('/[^A-Z ]/u', '', strtoupper(strip_tags($string))); // Sanitize, capitalize, remove numbers and special characters
+    $str_array = explode(' ', $string);
+
+    if (sizeof($str_array) > 2) {
+        $string = '';
+        foreach ($str_array as $word) {
+            $string .= substr($word, 0, 1);
+        }
+    } else if (sizeof($str_array) == 2) {
+        $string = substr($str_array[0], 0, 1);
+        $string .= substr($str_array[1], 0, 1) . substr($str_array[1], -1);
+    } else {
+        $first_char = substr($string, 0, 1);
+        $last_char = substr($string, -1);
+        $last_char = in_array($last_char, $vowels) ? substr($string, -2, 1) : $last_char; // Consider second last if last one is vowel
+        $string = str_replace($vowels, '', substr($string, 1, -1)); // Removefirst and last character, all vowels and spaces from middle section of string
+        $string = strlen($string) > 1 ? substr($string, (ceil(strlen($string) / 2) - 1), 1) : $string;
+        $string = $first_char . $string . $last_char;
+    }
+
+    $string = strlen($string) > 3 ? abb($string) : $string; // Re-abbreviate if character is more than 3
+    return $string;
+}