added some trivia algos

Author: lerabela

Challenges/check_anagrams.php

@@ -0,0 +1,22 @@
+<?php
+
+/**
+ * The is_anagram() function should determine whether two words are anagrams.
+ */
+
+function is_anagram($wrd_1, $wrd_2){
+
+    if(!ctype_alpha($wrd_1) || !ctype_alpha($wrd_2)){
+        return null;
+    }
+
+    if(count_chars($wrd_1,1) == count_chars($wrd_2,1)){
+        return "This two strings are anagram";
+    }
+
+    return "This two strings are not anagram";
+
+}
+
+print_r(is_anagram('anagram','nagaram')."\n");
+print_r(is_anagram('cat','rat')."\n");

Challenges/check_palindrome.php

@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * Check if a string is a Palindrome
+ */
+function check_palindrome(string $str): string{
+
+    try{
+
+        if(strrev($str) == $str){
+
+            return "Is Palindrome";
+
+        }else{
+
+            return "Not Palindrome";
+
+        }
+
+    }catch(\Exception $e){
+
+        exit($e->getMessage());
+        echo "\n\n";
+
+    }
+
+}
+
+echo check_palindrome("DAD");
+echo "\n\n";
+echo check_palindrome("MALAYALAM");
+echo "\n\n";
+echo check_palindrome("MALAYAAM");
+echo "\n\n";

Sorting/trivia/group_by_value.php

@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * group array
+ */
+$arr = array(
+"chimpanzee" => 20,
+"meeting" => 50,
+"dynasty" => 20,
+"chocolate" => 20,
+"bananas" => 50,
+"fantasy" => 30,
+"football" => 20
+);
+
+
+function group_by_value(array &$arr): array{
+
+    $results = [];
+
+    foreach($arr as $key => $val){
+
+        $results[$val][] = $key;
+
+    }
+
+    return $results;
+
+}
+
+print_r(group_by_value($arr));

Sorting/trivia/oddEven.php

@@ -0,0 +1,22 @@
+<?php
+
+/**
+ * Separate odd and even number
+ */
+
+// input array  
+$input = array(4, 3, 6, 5, 8, 7, 2); 
+
+$even = array_filter($input,function($val){
+
+    return ($val % 2 == 0)? 1 : -1;
+
+});
+
+$odd = array_filter($input,function($val){
+
+    return ($val % 2 != 0)? 1 : -1;
+
+});
+
+print_r($even);

Sorting/trivia/simple_uasort.php

@@ -0,0 +1,54 @@
+<?php
+
+/**
+ * Simple uasort example
+ */
+
+function simpple_sort(array &$usort): array{
+
+    try{
+
+        if(empty($usort) || count($usort) == 0){
+
+            throw new \Exception("Invalid array, please check array");
+
+        }
+
+        uasort($usort,function($val_1, $val_2){
+
+            if($val_1 > $val_2){
+
+                return 1;
+
+            }else if($val_1 < $val_2){
+
+                return -1;
+
+            }
+
+            return 0;
+
+        });
+
+        return $usort;
+
+    }catch(\Exception $e){
+
+        exit($e->getMessage());
+        echo "\n\n";
+
+    }
+
+}
+
+$arr = array("a" => 4,"b" => 2,"c" => 8,"d" => 6);
+
+$sorted = simpple_sort($arr);
+
+foreach($sorted as $ky => $vl){
+    
+    echo "key = " . $ky . " : " . " value = " . $vl ."\n";
+
+}
+
+echo "\n\n";

Sorting/trivia/sort_using_index.php

@@ -18,7 +18,7 @@ function index_sort(array &$sort, int $idx): array{
 
             if(!ctype_alpha($val_1) || !ctype_alpha($val_2)){
 
-                return null;
+                return 0;
 
             }
 
@@ -32,7 +32,7 @@ function index_sort(array &$sort, int $idx): array{
 
             }
 
-            return null;
+            return 0;
 
         });
 

Sorting/trivia/sort_using_last_char.php

@@ -18,7 +18,7 @@ function sort_last_char(array &$usort): array{
 
             if(!ctype_alpha($val_1) || !ctype_alpha($val_2)){
 
-                return null;
+                return 0;
 
             }    
 
@@ -32,7 +32,7 @@ function sort_last_char(array &$usort): array{
 
             }
 
-            return null;
+            return 0;
 
         });