diff --git a/doc/php_syntax_check.sh b/doc/php_syntax_check.sh
index 5f7edcd4f2..fe28d7d67d 100755
--- a/doc/php_syntax_check.sh
+++ b/doc/php_syntax_check.sh
@@ -11,30 +11,11 @@
 ### Use PHP environment variable to point to a certain PHP binary.
 ################################################################################
 
-cd ${1:-$(dirname $0)/..}
-
-find ${@-.} -name '*.php' -exec ${PHP:-php} -l {} \; 2>&1 | \
+find ${@-$(dirname $0)} -name '*.php' -exec ${PHP:-php} -l {} \; 2>&1 | \
 	# only show errors and PHP Deprecated, no success messages
 	egrep '^(PHP|Parse error)' | \
-	# suppress PHP Deprecated in vendor, as they need to be solved by the vendor
-	egrep -v '^PHP Deprecated.*/vendor/' | \
+	# suppress everything in vendor, as they need to be solved by the vendor
+	egrep -v 'vendor/' | \
 	# output everything to stderr
 	tee /dev/fd/2 | \
-	# exclude several known problems, to be able to find new ones
-	# exclude old / not used PEAR Autoloader giving PHP Fatal error:  Method PEAR_Autoloader::__call() must take exactly 2 arguments
-	grep -v 'vendor/pear-pear.php.net/PEAR/PEAR/Autoloader.php' | \
-	# exclude PEAR tests giving PHP Parse error:  syntax error, unexpected 'new' (T_NEW)
-	grep -v 'vendor/pear/pear/tests/' | \
-	# exclude composer conditional included autoload_static.php, as it requires PHP 5.6+
-	grep -v 'vendor/composer/autoload_static.php' | \
-	# exclude vendor/phpunit it shows many PHP Parse errors in PHP < 7.4
-	grep -v 'vendor/phpunit' | \
-	# suppress PHP Parse errors in PHP < 7.0 in dependency of phpunit: phpspec/prophecy
-	grep -v 'vendor/phpspec/prophecy' | \
-	# phpFreeChat does not work with PHP7
-	grep -v 'phpfreechat/phpfreechat/' | \
-	# vendor/myclabs gives errors in PHP < 7.4
-	grep -v 'vendor/myclabs/' | \
-	# not used part of ADOdb give PHP Fatal error: Cannot unset $this
-	grep -v 'adodb-xmlschema' | \
 	perl -pe 'END { exit $status } $status=1 if /^(PHP Fatal|(PHP )?Parse error)/;'  > /dev/null