add wraper to databases; reorganize structure and add composer support

composer.json

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+{
+    "name": "fbraz3/php5-compatibility-layer",
+    "description": "Implementa de forma transparente funções que foram descontinuadas no PHP7",
+    "type": "library",
+    "license": "GPL-3.0",
+    "require": {
+        "php": "^7.0",
+      "ext-openssl": "*"
+    },
+    "autoload": {
+        "files": [
+            "src/wrapper-legacy.php",
+            "src/wrapper-mssql.php",
+            "src/wrapper-mysql.php"
+        ]
+    }
+}

examples/mysql.php

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+<?php
+
+if (!function_exists('mysql_connect')) {
+    echo "Function mysql_connect not exists!\n";
+}
+
+require_once __DIR__ . '/../vendor/autoload.php';
+
+if (function_exists('mysql_connect')) {
+    echo "Function mysql_connect now exists!\n";
+}

src/wrapper-legacy.php

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+<?php
+/**
+ * Created by PhpStorm.
+ * User: felipebraz
+ * Date: 09/07/18
+ * Time: 13:33
+ */
+
+if (!function_exists('ereg')) {
+    function ereg($pattern, $subject, &$matches = array())
+    {
+        return preg_match('/' . $pattern . '/', $subject, $matches);
+    }
+}
+if (!function_exists('eregi')) {
+    function eregi($pattern, $subject, &$matches = array())
+    {
+        return preg_match('/' . $pattern . '/i', $subject, $matches);
+    }
+}
+if (!function_exists('ereg_replace')) {
+    function ereg_replace($pattern, $replacement, $string)
+    {
+        return preg_replace('/' . $pattern . '/', $replacement, $string);
+    }
+}
+if (!function_exists('eregi_replace')) {
+    function eregi_replace($pattern, $replacement, $string)
+    {
+        return preg_replace('/' . $pattern . '/i', $replacement, $string);
+    }
+}
+if (!function_exists('split')) {
+    function split($pattern, $subject, $limit = -1)
+    {
+        return preg_split('/' . $pattern . '/', $subject, $limit);
+    }
+}
+if (!function_exists('spliti')) {
+    function spliti($pattern, $subject, $limit = -1)
+    {
+        return preg_split('/' . $pattern . '/i', $subject, $limit);
+    }
+}
+if (!function_exists('session_unregister')) {
+    function session_unregister($value)
+    {
+        unset($_SESSION[$value]);
+        return true;
+    }
+}
+if (!function_exists('session_register')) {
+    function session_register($variavel)
+    {
+        global $$variavel;
+        $_SESSION[$variavel] = $$variavel;
+        return true;
+    }
+}
+
+/**
+ * Escapa as mesmas strings do mysql_real_escape_string, mas sem precisar de ponteiro de conexao
+ * "Characters encoded are \, ', ", NUL (ASCII 0), \n, \r, and Control+Z"
+ * @see https://dev.mysql.com/doc/refman/5.7/en/mysql-real-escape-string.html
+ * @see https://stackoverflow.com/questions/1162491/alternative-to-mysql-real-escape-string-without-connecting-to-db
+ * @param string $value
+ * @return string
+ */
+function mres($value)
+{
+    $search = array("\\", "\x00", "\n", "\r", "'", '"', "\x1a");
+    $replace = array("\\\\", "\\0", "\\n", "\\r", "\'", '\"', "\\Z");
+
+    return str_replace($search, $replace, $value);
+}
+
+if (!function_exists('mysql_real_escape_string')) {
+    /**
+     * Escapes special characters in a string for use in an SQL statement
+     * @link http://php.net/manual/en/function.mysql-real-escape-string.php
+     * The string that is to be escaped.
+     * </p>
+     * @return string the escaped string, or false on error.
+     * @since 4.3.0
+     * @since 5.0
+     */
+    function mysql_real_escape_string($value)
+    {
+        return mres($value);
+    }
+}
+if (!function_exists('mysql_escape_string')) {
+    /**
+     * Escapes a string for use in a mysql_query
+     * @link http://php.net/manual/en/function.mysql-escape-string.php
+     * @deprecated 5.3.0 Use mysql_real_escape_string() instead
+     * The string that is to be escaped.
+     * </p>
+     * @return string the escaped string.
+     * @since 4.0.3
+     * @since 5.0
+     */
+    function mysql_escape_string($value)
+    {
+        return mres($value);
+    }
+}