has prefix

Author: Dogan Ucar

composer.json

@@ -17,7 +17,9 @@
   "require": {
     "doganoo/php-algorithms": "*",
     "apache/log4php": "2.3.0",
-    "ext-fileinfo": "*"
+    "ext-fileinfo": "*",
+    "ext-iconv": "*",
+    "ext-mbstring": "*"
   },
   "require-dev": {
     "phpunit/phpunit": "6.5"

src/Datatype/StringClass.php

@@ -181,4 +181,16 @@ public function getSubstring(int $count) {
         $return = substr($this->value, 0, $count);
         return $return;
     }
+
+    /**
+     * checks a prefix
+     *
+     * have a look here: https://stackoverflow.com/a/2790919
+     *
+     * @param string $prefix
+     * @return bool
+     */
+    public function hasPrefix(string $prefix):bool {
+        return true === (substr( $this->getValue(), 0, strlen($prefix)) === $prefix);
+    }
 }

src/Util/StringUtil.php

@@ -20,6 +20,8 @@
  */
 
 namespace doganoo\PHPUtil\Util;
+use doganoo\PHPUtil\Datatype\StringClass;
+
 /**
  * Class StringUtil
  *
@@ -86,4 +88,14 @@ public static function toUTF8(string $string): string {
     public static function getEncoding(string $string): string {
         return \mb_detect_encoding($string, "auto", true);
     }
+
+    /**
+     * @param string $string
+     * @param string $prefix
+     * @return bool
+     */
+    public static function hasPrefix(string $string, string $prefix):bool {
+        $stringClass = new StringClass($string);
+        return $stringClass->hasPrefix($prefix);
+    }
 }

test/Util/StringUtilTest.php

@@ -0,0 +1,45 @@
+<?php
+/**
+ * MIT License
+ *
+ * Copyright (c) 2018 Dogan Ucar, <dogan@dogan-ucar.de>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+use doganoo\PHPUtil\Datatype\StringClass;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Class StringUtilTest
+ */
+class StringUtilTest extends TestCase {
+
+    /**
+     * test prefix
+     */
+    public function testPrefix(){
+        $string = new StringClass("doganucar");
+
+        $this->assertTrue(true === $string->hasPrefix("dogan"));
+        $this->assertTrue(false === $string->hasPrefix("ucar"));
+
+    }
+
+}