Mostrar alter table este es el codigo del aporte
Código PHP:
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<?php
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# % -> esta línea la pueden quitar es para evitar un error con el highlight
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set_time_limit(0);
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define('DB_NAME', 'nombre');
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define('DB_HOST', 'localhost');
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define('DB_USER', 'usuario');
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define('DB_PASS', 'contraseña');
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function setQuery($setSelectQueryStr, $fetchType = NULL){
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$arr = array();
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try{
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$db = new PDO('mysql:host=' . DB_HOST . ';dbname=' . DB_NAME, DB_USER, DB_PASS);
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$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
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$pdoQuery = $db->query($setSelectQueryStr);
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$fetchType = empty($fetchType) ? PDO::FETCH_ASSOC : $fetchType;
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$arr = ($pdoQuery->rowCount() > 0) ? $pdoQuery->fetchAll($fetchType) : array();
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}catch(PDOException $e){
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echo $e->getMessage();
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exit;
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}
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return $arr;
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}
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define('NL', PHP_EOL);
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$drop = true;
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$tables = array();
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$extra = array();
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$constraints = array();
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$f = fopen(DB_NAME . '.sql', 'w');
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$query = setQuery('SHOW TABLES FROM `' . DB_NAME . '`', PDO::FETCH_NUM);
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foreach($query as $row){
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$tables[] = $row[0];
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}
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$extra['dumpVersion'] = "1.0";
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$extra['dtTm'] = date("Y-m-d H:i:s");
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$extra['serverVersion'] = $db->getAttribute(PDO::ATTR_SERVER_VERSION);
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$extra['phpVersion'] = phpversion();
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$extra['dbName'] = DB_NAME;
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$t = array();
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foreach($tables as $k => $v){
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$t[] = "[$k] => $v;";
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}
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$extra['tables'] = implode(NL . '-- ', $t);
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$text = <<<HEADERTEXT
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-- dumpFDW
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-- version {$extra['dumpVersion']}
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-- http://www.forosdelweb.com/miembros/abimaelrc/
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--
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-- Host: {$_SERVER['HTTP_HOST']}
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-- Generation Time: {$extra['dtTm']}
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-- Server version: {$extra['serverVersion']}
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-- PHP Version: {$extra['phpVersion']}
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-- Database: '{$extra['dbName']}'
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-- Tables: {$extra['tables']}
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HEADERTEXT;
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fwrite($f, $text);
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foreach ($tables as $table){
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fwrite($f, NL . NL .($drop ? "DROP TABLE IF EXISTS `$table`;" : "-- No especificado.") . NL);
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$query = setQuery("SHOW CREATE TABLE `$table`", PDO::FETCH_NUM);
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foreach($query as $row){
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$arr = explode("\n", $row[1]);
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$tmpArr = array();
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foreach($arr as $key => $value){
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if(stripos($value, "CONSTRAINT") !== false){
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$tmpArr[] = ' ADD ' . trim($value);
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if(array_key_exists($key - 1, $arr)){
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$arr[$key - 1] = str_replace(',','',$arr[$key - 1]);
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}
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unset($arr[$key]);
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}
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}
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if(!empty($tmpArr)){
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$constraints[] = 'ALTER TABLE ' . $row[0] . NL . implode(NL, $tmpArr) . ';';
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}
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fwrite($f, implode(NL, $arr) . ';' . NL . NL);
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}
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$query = setQuery("SELECT * FROM `$table`");
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$n = 0;
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$nR = count($query) - 1;
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foreach($query as $qry){
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$columnas = array_keys($qry);
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$values = array();
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$keys = array();
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foreach($columnas as $columna){
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$keys[] = "`".$columna."`";
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if( is_numeric($qry[$columna]) || is_null($qry[$columna]) ){
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$values[] = $qry[$columna];
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} else{
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$values[] = "'" . str_replace(array("'", NL), array("''", '\r\n'), addcslashes($qry[$columna], '\\')) . "'";
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}
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}
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/* $sC = special Char, saber cual cáracter especial colocar al final del código */
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$sC = ($n%2000 == 1999 || $n == $nR ? ";" : ",");
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if($n%2000 == 0){
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fwrite($f, "INSERT INTO `$table`(".implode(", ", $keys).") VALUES " . NL . "(" . implode(", ", $values) . ")" . $sC . NL);
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}else{
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fwrite($f, "(" . implode(", ", $values) . ")" . $sC . NL);
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}
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$n++;
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}
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}
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if(!empty($constraints)){
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fwrite($f, NL . NL . implode(NL . NL, $constraints));
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}
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fclose($f); 
pues como te conte anteriorment el trab que estoy desarrollando mis "super jefes" quieren que les muestre el archivo .sql tal como lo hace phpmyadmin cuando exportas una bd 
