diff --git a/sapi/fpm/fpm/fpm_conf.c b/sapi/fpm/fpm/fpm_conf.c
index ef9b35a9994aa..a7aa900d3c479 100644
--- a/sapi/fpm/fpm/fpm_conf.c
+++ b/sapi/fpm/fpm/fpm_conf.c
@@ -213,8 +213,21 @@ static int fpm_conf_expand_pool_name(char **value) {
 static char *fpm_conf_set_boolean(zval *value, void **config, intptr_t offset) /* {{{ */
 {
 	zend_string *val = Z_STR_P(value);
-	bool value_y = zend_string_equals_literal(val, "1");
-	bool value_n = ZSTR_LEN(val) == 0; /* Empty string is the only valid false value */
+	/* we need to check all alowed values to correctly set value from the environment varaible */
+	bool value_y = (
+		zend_string_equals_literal(val, "1") ||
+		zend_string_equals_literal(val, "yes") ||
+		zend_string_equals_literal(val, "true") ||
+		zend_string_equals_literal(val, "on")
+	);
+	bool value_n = (
+		value_y || ZSTR_LEN(val) == 0 ||
+		zend_string_equals_literal(val, "no") ||
+		zend_string_equals_literal(val, "none") ||
+		zend_string_equals_literal(val, "false") ||
+		zend_string_equals_literal(val, "off")
+	);
+
 
 	if (!value_y && !value_n) {
 		return "invalid boolean value";
diff --git a/sapi/fpm/tests/gh13563-conf-bool-env.phpt b/sapi/fpm/tests/gh13563-conf-bool-env.phpt
new file mode 100644
index 0000000000000..6f53bf0393cb9
--- /dev/null
+++ b/sapi/fpm/tests/gh13563-conf-bool-env.phpt
@@ -0,0 +1,72 @@
+--TEST--
+FPM: GH-13563 - conf boolean environment variables values
+--SKIPIF--
+<?php
+include "skipif.inc";
+FPM\Tester::skipIfRoot();
+?>
+--FILE--
+<?php
+
+require_once "tester.inc";
+
+$cfg = <<<EOT
+[global]
+error_log = {{FILE:LOG}}
+log_limit = 1024
+log_buffering = \${FPM_TEST_LOG_BUF}
+daemonize = \${FPM_TEST_DAEMONIZE}
+[unconfined]
+listen = {{ADDR}}
+process.dumpable = \${FPM_TEST_PROC_DUMP}
+pm = dynamic
+pm.max_children = 5
+pm.start_servers = 1
+pm.min_spare_servers = 1
+pm.max_spare_servers = 3
+catch_workers_output = \${FPM_TEST_CATCH_WRK_OUT}
+decorate_workers_output = \${FPM_TEST_DECOR_WRK_OUT}
+clear_env = \${FPM_TEST_CLEAR_ENV}
+EOT;
+
+$code = <<<EOT
+<?php
+foreach (getenv() as \$name => \$val) {
+    if (str_starts_with(\$name, 'FPM_TEST')) {
+        printf("%s: %s\n", \$name, \$val);
+    }
+}
+file_put_contents('php://stderr', str_repeat('a', 20) . "\n");
+EOT;
+
+$tester = new FPM\Tester($cfg, $code);
+$tester->start(envVars: [
+    'FPM_TEST_LOG_BUF' => 'on',
+    'FPM_TEST_DAEMONIZE' => 'false',
+    'FPM_TEST_PROC_DUMP' => 'no',
+    'FPM_TEST_CATCH_WRK_OUT' => 'yes',
+    'FPM_TEST_DECOR_WRK_OUT' => 'true',
+    'FPM_TEST_CLEAR_ENV' => 'none',
+]);
+$tester->expectLogStartNotices();
+$tester->request()->expectBody([
+    'FPM_TEST_LOG_BUF: on',
+    'FPM_TEST_DAEMONIZE: false',
+    'FPM_TEST_PROC_DUMP: no',
+    'FPM_TEST_CATCH_WRK_OUT: yes',
+    'FPM_TEST_DECOR_WRK_OUT: true',
+    'FPM_TEST_CLEAR_ENV: none',
+]);
+$tester->terminate();
+$tester->expectLogMessage('a', 1024, 20, true);
+$tester->close();
+
+?>
+Done
+--EXPECT--
+Done
+--CLEAN--
+<?php
+require_once "tester.inc";
+FPM\Tester::clean();
+?>
diff --git a/sapi/fpm/tests/tester.inc b/sapi/fpm/tests/tester.inc
index 66cbad175298d..ff834c329fa50 100644
--- a/sapi/fpm/tests/tester.inc
+++ b/sapi/fpm/tests/tester.inc
@@ -432,6 +432,7 @@ class Tester
         bool $daemonize = false,
         array $extensions = [],
         array $iniEntries = [],
+        array $envVars = [],
     ) {
         $configFile = $this->createConfig();
         $desc       = $this->outDesc ? [] : [1 => array('pipe', 'w'), 2 => array('redirect', 1)];
@@ -465,7 +466,7 @@ class Tester
         $cmd = array_merge($cmd, $extraArgs);
         $this->trace('Starting FPM using command:', $cmd, true);
 
-        $this->masterProcess = proc_open($cmd, $desc, $pipes);
+        $this->masterProcess = proc_open($cmd, $desc, $pipes, null, $envVars);
         register_shutdown_function(
             function ($masterProcess) use ($configFile) {
                 @unlink($configFile);