diff --git a/UPGRADING b/UPGRADING
index 4b0621dab28..6ce27cef86f 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -250,6 +250,14 @@ PHP 7.4 UPGRADE NOTES
     PREG_OFFSET_CAPTURE and PREG_UNMATCHED_AS_NULL flags. This influences the
     format of the matches array passed to to the callback function.
 
+- PDO:
+  . The username and password can now be specified as part of the PDO DSN for
+    the mysql, mssql, sybase, dblib, firebird and oci drivers. Previously this
+    was only supported by the pgsql driver. If a username/password is specified
+    both in the constructor and the DSN, the constructor takes precedence.
+
+        new PDO("mysql:host=xxx;port=xxx;dbname=xxx;user=xxx;password=xxx");
+
 - PDO_OCI:
   . PDOStatement::getColumnMeta() is now available
 
diff --git a/appveyor/test_task.bat b/appveyor/test_task.bat
index 2abe96642a4..ba6a862f22a 100644
--- a/appveyor/test_task.bat
+++ b/appveyor/test_task.bat
@@ -27,7 +27,7 @@ set PDO_MYSQL_TEST_USER=%MYSQL_TEST_USER%
 set PDO_MYSQL_TEST_PASS=%MYSQL_PWD%
 set PDO_MYSQL_TEST_HOST=%MYSQL_TEST_HOST%
 set PDO_MYSQL_TEST_PORT=%MYSQL_TEST_PORT%
-set PDO_MYSQL_TEST_DSN=mysql:host=%PDO_MYSQL_TEST_HOST%;port=%PDO_MYSQL_TEST_PORT%;dbname=test;user=%PDO_MYSQL_TEST_USER%;password=%MYSQL_PW%
+set PDO_MYSQL_TEST_DSN=mysql:host=%PDO_MYSQL_TEST_HOST%;port=%PDO_MYSQL_TEST_PORT%;dbname=test
 "C:\Program Files\MySql\MySQL Server 5.7\bin\mysql.exe" --user=%MYSQL_TEST_USER% -e "CREATE DATABASE IF NOT EXISTS test"
 if %errorlevel% neq 0 exit /b 3
 
diff --git a/ext/pdo/tests/pdo_dsn_containing_credentials.phpt b/ext/pdo/tests/pdo_dsn_containing_credentials.phpt
new file mode 100644
index 00000000000..dca3ba1709e
--- /dev/null
+++ b/ext/pdo/tests/pdo_dsn_containing_credentials.phpt
@@ -0,0 +1,51 @@
+--TEST--
+PDO Common: Pass credentials in dsn instead of constructor params
+--SKIPIF--
+<?php
+if (!extension_loaded('pdo')) die('skip');
+$dir = getenv('REDIR_TEST_DIR');
+if (false == $dir) die('skip no driver');
+
+$driver = substr(getenv('PDOTEST_DSN'), 0, strpos(getenv('PDOTEST_DSN'), ':'));
+if (!in_array($driver, array('mssql','sybase','dblib','firebird','mysql','oci')))
+	die('skip not supported');
+
+require_once $dir . 'pdo_test.inc';
+PDOTest::skip();
+?>
+--FILE--
+<?php
+	require_once getenv('REDIR_TEST_DIR') . 'pdo_test.inc';
+
+	$orgDsn = getenv('PDOTEST_DSN');
+	$orgUser = getenv('PDOTEST_USER');
+	$orgPass = getenv('PDOTEST_PASS');
+
+	try
+	{
+		putenv("PDOTEST_DSN=$orgDsn;user=$orgUser;password=$orgPass");
+		putenv("PDOTEST_USER");
+		putenv("PDOTEST_PASS");
+
+		$link = PDOTest::factory();
+		echo "using credentials in dsn: done\n";
+
+
+		// test b/c - credentials in DSN are ignored when user/pass passed as separate params
+		putenv("PDOTEST_DSN=$orgDsn;user=incorrect;password=ignored");
+		putenv("PDOTEST_USER=$orgUser");
+		putenv("PDOTEST_PASS=$orgPass");
+
+		$link = PDOTest::factory();
+		echo "ignoring credentials in dsn: done\n";
+	}
+	finally
+	{
+		putenv("PDOTEST_DSN=$orgDsn");
+		putenv("PDOTEST_USER=$orgUser");
+		putenv("PDOTEST_PASS=$orgPass");
+	}
+?>
+--EXPECTF--
+using credentials in dsn: done
+ignoring credentials in dsn: done
diff --git a/ext/pdo_dblib/dblib_driver.c b/ext/pdo_dblib/dblib_driver.c
index 748929e5325..7f2b7ebe3cf 100644
--- a/ext/pdo_dblib/dblib_driver.c
+++ b/ext/pdo_dblib/dblib_driver.c
@@ -458,6 +458,8 @@ static int pdo_dblib_handle_factory(pdo_dbh_t *dbh, zval *driver_options)
 		,{ "dbname",	NULL,	0 }
 		,{ "secure",	NULL,	0 } /* DBSETLSECURE */
 		,{ "version",	NULL,	0 } /* DBSETLVERSION */
+		,{ "user",      NULL,   0 }
+		,{ "password",  NULL,   0 }
 	};
 
 	nvars = sizeof(vars)/sizeof(vars[0]);
@@ -519,12 +521,20 @@ static int pdo_dblib_handle_factory(pdo_dbh_t *dbh, zval *driver_options)
 		}
 	}
 
+	if (!dbh->username && vars[6].optval) {
+		dbh->username = vars[6].optval;
+	}
+
 	if (dbh->username) {
 		if(FAIL == DBSETLUSER(H->login, dbh->username)) {
 			goto cleanup;
 		}
 	}
 
+	if (!dbh->password && vars[7].optval) {
+		dbh->password = vars[7].optval;
+	}
+
 	if (dbh->password) {
 		if(FAIL == DBSETLPWD(H->login, dbh->password)) {
 			goto cleanup;
diff --git a/ext/pdo_firebird/firebird_driver.c b/ext/pdo_firebird/firebird_driver.c
index 53ffbdc7c67..e1b03a46016 100644
--- a/ext/pdo_firebird/firebird_driver.c
+++ b/ext/pdo_firebird/firebird_driver.c
@@ -623,14 +623,24 @@ static int pdo_firebird_handle_factory(pdo_dbh_t *dbh, zval *driver_options) /*
 	struct pdo_data_src_parser vars[] = {
 		{ "dbname", NULL, 0 },
 		{ "charset",  NULL,	0 },
-		{ "role", NULL,	0 }
+		{ "role", NULL,	0 },
+		{ "user", NULL, 0 },
+		{ "password", NULL, 0 }
 	};
 	int i, ret = 0;
 	short buf_len = 256, dpb_len;
 
 	pdo_firebird_db_handle *H = dbh->driver_data = pecalloc(1,sizeof(*H),dbh->is_persistent);
 
-	php_pdo_parse_data_source(dbh->data_source, dbh->data_source_len, vars, 3);
+	php_pdo_parse_data_source(dbh->data_source, dbh->data_source_len, vars, 5);
+
+	if (!dbh->username && vars[3].optval) {
+		dbh->username = vars[3].optval;
+	}
+
+	if (!dbh->password && vars[4].optval) {
+		dbh->password = vars[4].optval;
+	}
 
 	do {
 		static char const dpb_flags[] = {
diff --git a/ext/pdo_mysql/mysql_driver.c b/ext/pdo_mysql/mysql_driver.c
index ad7989d6609..6910582ba5c 100644
--- a/ext/pdo_mysql/mysql_driver.c
+++ b/ext/pdo_mysql/mysql_driver.c
@@ -568,9 +568,11 @@ static int pdo_mysql_handle_factory(pdo_dbh_t *dbh, zval *driver_options)
 	struct pdo_data_src_parser vars[] = {
 		{ "charset",  NULL,	0 },
 		{ "dbname",   "",	0 },
-		{ "host",   "localhost",	0 },
-		{ "port",   "3306",	0 },
+		{ "host",     "localhost",	0 },
+		{ "port",     "3306",	0 },
 		{ "unix_socket",  PDO_DEFAULT_MYSQL_UNIX_ADDR,	0 },
+		{ "user",     NULL,	0 },
+		{ "password", NULL,	0 },
 	};
 	int connect_opts = 0
 #ifdef CLIENT_MULTI_RESULTS
@@ -596,7 +598,7 @@ static int pdo_mysql_handle_factory(pdo_dbh_t *dbh, zval *driver_options)
 	PDO_DBG_INF("multi results");
 #endif
 
-	php_pdo_parse_data_source(dbh->data_source, dbh->data_source_len, vars, 5);
+	php_pdo_parse_data_source(dbh->data_source, dbh->data_source_len, vars, 7);
 
 	H = pecalloc(1, sizeof(pdo_mysql_db_handle), dbh->is_persistent);
 
@@ -808,6 +810,14 @@ static int pdo_mysql_handle_factory(pdo_dbh_t *dbh, zval *driver_options)
 		unix_socket = vars[4].optval;
 	}
 
+	if (!dbh->username && vars[5].optval) {
+		dbh->username = vars[5].optval;
+	}
+
+	if (!dbh->password && vars[6].optval) {
+		dbh->password = vars[6].optval;
+	}
+
 	/* TODO: - Check zval cache + ZTS */
 #ifdef PDO_USE_MYSQLND
 	if (dbname) {
diff --git a/ext/pdo_oci/oci_driver.c b/ext/pdo_oci/oci_driver.c
index eb1f70bdb09..3ee02657c3d 100644
--- a/ext/pdo_oci/oci_driver.c
+++ b/ext/pdo_oci/oci_driver.c
@@ -678,10 +678,12 @@ static int pdo_oci_handle_factory(pdo_dbh_t *dbh, zval *driver_options) /* {{{ *
 	int i, ret = 0;
 	struct pdo_data_src_parser vars[] = {
 		{ "charset",  NULL,	0 },
-		{ "dbname",   "",	0 }
+		{ "dbname",   "",	0 },
+		{ "user",     NULL, 0 },
+		{ "password", NULL, 0 }
 	};
 
-	php_pdo_parse_data_source(dbh->data_source, dbh->data_source_len, vars, 2);
+	php_pdo_parse_data_source(dbh->data_source, dbh->data_source_len, vars, 4);
 
 	H = pecalloc(1, sizeof(*H), dbh->is_persistent);
 	dbh->driver_data = H;
@@ -745,6 +747,10 @@ static int pdo_oci_handle_factory(pdo_dbh_t *dbh, zval *driver_options) /* {{{ *
 	}
 
 	/* username */
+	if (!dbh->username && vars[2].optval) {
+		dbh->username = vars[2].optval;
+	}
+
 	if (dbh->username) {
 		H->last_err = OCIAttrSet(H->session, OCI_HTYPE_SESSION,
 			   	dbh->username, (ub4) strlen(dbh->username),
@@ -756,6 +762,10 @@ static int pdo_oci_handle_factory(pdo_dbh_t *dbh, zval *driver_options) /* {{{ *
 	}
 
 	/* password */
+	if (!dbh->password && vars[3].optval) {
+		dbh->password = vars[3].optval;
+	}
+
 	if (dbh->password) {
 		H->last_err = OCIAttrSet(H->session, OCI_HTYPE_SESSION,
 			   	dbh->password, (ub4) strlen(dbh->password),