diff --git a/ext/standard/JitCsvArg.php b/ext/standard/JitCsvArg.php
new file mode 100644
index 00000000000..b41429e7990
--- /dev/null
+++ b/ext/standard/JitCsvArg.php
@@ -0,0 +1,70 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PHPCompiler\ext\standard;
+
+use PHPCompiler\JIT\BasicBlockHelper;
+use PHPCompiler\JIT\Builtin\TypeErrorRaise;
+use PHPCompiler\JIT\Context;
+use PHPCompiler\JIT\Variable as JITVariable;
+use PHPLLVM\Builder;
+use PHPLLVM\Value;
+
+/** LLVM validation for fputcsv() CSV option strings (#4530, ext/standard/file.c). */
+final class JitCsvArg
+{
+    public static function validateFputcsvCall(Context $context, int $argc, JITVariable ...$args): void
+    {
+        if ($argc >= 3) {
+            self::validateArg($context, $args[2], 3, 'separator', false);
+        }
+        if ($argc >= 4) {
+            self::validateArg($context, $args[3], 4, 'enclosure', false);
+        }
+        if ($argc >= 5) {
+            self::validateArg($context, $args[4], 5, 'escape', true);
+        }
+    }
+
+    private static function validateArg(
+        Context $context,
+        JITVariable $arg,
+        int $argNum,
+        string $paramName,
+        bool $allowEmpty,
+    ): void {
+        if (null !== ($arg->compileTimeString ?? null)) {
+            return;
+        }
+
+        $message = $allowEmpty
+            ? \sprintf('fputcsv(): Argument #%d ($%s) must be empty or a single character', $argNum, $paramName)
+            : \sprintf('fputcsv(): Argument #%d ($%s) must be a single character', $argNum, $paramName);
+
+        TypeErrorRaise::registerDeclarations($context);
+        TypeErrorRaise::ensureLinked($context);
+        $strPtr = $context->builder->load(
+            $context->helper->loadValue($arg)
+        );
+        $map = $context->structFieldMap['__string__'];
+        $len = $context->builder->load(
+            $context->builder->structGep($strPtr, $map['length'])
+        );
+        $i64 = $context->getTypeFromString('int64');
+        $one = $i64->constInt(1, false);
+        $failBlock = BasicBlockHelper::append($context, 'fputcsv_csv_arg_fail_'.$argNum);
+        $okBlock = BasicBlockHelper::append($context, 'fputcsv_csv_arg_ok_'.$argNum);
+        if ($allowEmpty) {
+            $tooLong = $context->builder->icmp(Builder::INT_SGT, $len, $one);
+            $context->builder->branchIf($tooLong, $failBlock, $okBlock);
+        } else {
+            $notOne = $context->builder->icmp(Builder::INT_NE, $len, $one);
+            $context->builder->branchIf($notOne, $failBlock, $okBlock);
+        }
+        $context->builder->positionAtEnd($failBlock);
+        TypeErrorRaise::emitValueError($context, $message);
+        $context->builder->call($context->lookupFunction('abort'));
+        $context->builder->positionAtEnd($okBlock);
+    }
+}
diff --git a/ext/standard/VmCsvArg.php b/ext/standard/VmCsvArg.php
new file mode 100644
index 00000000000..1e5fc8717b2
--- /dev/null
+++ b/ext/standard/VmCsvArg.php
@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PHPCompiler\ext\standard;
+
+/**
+ * CSV delimiter/enclosure/escape validation (php-src ext/standard/file.c, issues #4530, #1193).
+ */
+final class VmCsvArg
+{
+    public static function validateFputcsvOptions(
+        string $separator,
+        string $enclosure,
+        string $escape,
+    ): void {
+        self::requireSingleChar($separator, 3, 'separator');
+        self::requireSingleChar($enclosure, 4, 'enclosure');
+        self::requireEmptyOrSingleChar($escape, 5, 'escape');
+    }
+
+    public static function requireSingleChar(string $value, int $argNum, string $paramName): void
+    {
+        if (1 !== \strlen($value)) {
+            throw new \ValueError(\sprintf(
+                'fputcsv(): Argument #%d ($%s) must be a single character',
+                $argNum,
+                $paramName
+            ));
+        }
+    }
+
+    public static function requireEmptyOrSingleChar(string $value, int $argNum, string $paramName): void
+    {
+        if (\strlen($value) > 1) {
+            throw new \ValueError(\sprintf(
+                'fputcsv(): Argument #%d ($%s) must be empty or a single character',
+                $argNum,
+                $paramName
+            ));
+        }
+    }
+}
diff --git a/ext/standard/fputcsv.php b/ext/standard/fputcsv.php
index 6d22c5c3967..f60c689d4e4 100644
--- a/ext/standard/fputcsv.php
+++ b/ext/standard/fputcsv.php
@@ -6,6 +6,8 @@
 
 use PHPCompiler\Frame;
 use PHPCompiler\Func\Internal;
+use PHPCompiler\JIT\BasicBlockHelper;
+use PHPCompiler\JIT\Builtin\TypeErrorRaise;
 use PHPCompiler\JIT\Context;
 use PHPCompiler\JIT\HashTableHelper;
 use PHPCompiler\JIT\JitLongArg;
@@ -49,6 +51,7 @@ public function execute(Frame $frame): void
         if ($argc >= 5) {
             $escape = VmReflection::stringArg($frame->calledArgs[4], 'fputcsv() escape', 4);
         }
+        VmCsvArg::validateFputcsvOptions($separator, $enclosure, $escape);
         $fields = [];
         foreach ($fieldsVar->toArray()->iterate(true) as $value) {
             $value = $value->resolveIndirect();
@@ -95,6 +98,11 @@ public function call(Context $context, JITVariable ...$args): Value
         if ($argc < 2 || $argc > 5) {
             throw new \LogicException('fputcsv() requires two to five arguments in this compiler build');
         }
+        $compileTimeFailure = $this->emitCompileTimeCsvValidationFailure($context, $argc, ...$args);
+        if (null !== $compileTimeFailure) {
+            return $compileTimeFailure;
+        }
+        JitCsvArg::validateFputcsvCall($context, $argc, ...$args);
         $i64 = $context->getTypeFromString('int64');
         $strPtr = $context->getTypeFromString('__string__*');
         $handle = $context->builder->truncOrBitCast(
@@ -135,4 +143,42 @@ private function loadFields(Context $context, JITVariable $arg): Value
 
         throw new \LogicException('fputcsv() fields must be an array in this compiler build');
     }
+
+    private function emitCompileTimeCsvValidationFailure(Context $context, int $argc, JITVariable ...$args): ?Value
+    {
+        $checks = [
+            [3, 'separator', false, 2],
+            [4, 'enclosure', false, 3],
+            [5, 'escape', true, 4],
+        ];
+        foreach ($checks as [$argNum, $paramName, $allowEmpty, $argIndex]) {
+            if ($argc < $argNum) {
+                continue;
+            }
+            $literal = $args[$argIndex]->compileTimeString ?? null;
+            if (null === $literal) {
+                continue;
+            }
+            $invalid = $allowEmpty ? \strlen($literal) > 1 : 1 !== \strlen($literal);
+            if (!$invalid) {
+                continue;
+            }
+            $message = $allowEmpty
+                ? \sprintf('fputcsv(): Argument #%d ($%s) must be empty or a single character', $argNum, $paramName)
+                : \sprintf('fputcsv(): Argument #%d ($%s) must be a single character', $argNum, $paramName);
+            TypeErrorRaise::registerDeclarations($context);
+            TypeErrorRaise::ensureLinked($context);
+            $errBlock = BasicBlockHelper::append($context, 'fputcsv_csv_lit_err_'.$argNum);
+            $afterBlock = BasicBlockHelper::append($context, 'fputcsv_csv_lit_after_'.$argNum);
+            $context->builder->branch($errBlock);
+            $context->builder->positionAtEnd($errBlock);
+            TypeErrorRaise::emitValueError($context, $message);
+            $context->builder->call($context->lookupFunction('abort'));
+            $context->builder->positionAtEnd($afterBlock);
+
+            return $context->getTypeFromString('int64')->constInt(0, false);
+        }
+
+        return null;
+    }
 }
diff --git a/test/compliance/cases/stdlib/fputcsv_bad_handle.phpt b/test/compliance/cases/stdlib/fputcsv_bad_handle.phpt
new file mode 100644
index 00000000000..1a9f31a5f3b
--- /dev/null
+++ b/test/compliance/cases/stdlib/fputcsv_bad_handle.phpt
@@ -0,0 +1,11 @@
+--TEST--
+stdlib fputcsv() — bad stream handle TypeError (#4530, ext/standard/file.c)
+--FILE--
+<?php
+try {
+    fputcsv(123, ['a']);
+} catch (Throwable $e) {
+    echo get_class($e), ': ', $e->getMessage(), "\n";
+}
+--EXPECT--
+TypeError: fputcsv(): Argument #1 ($stream) must be of type resource, int given
diff --git a/test/compliance/cases/stdlib/fputcsv_escape.phpt b/test/compliance/cases/stdlib/fputcsv_escape.phpt
new file mode 100644
index 00000000000..01809fe5044
--- /dev/null
+++ b/test/compliance/cases/stdlib/fputcsv_escape.phpt
@@ -0,0 +1,25 @@
+--TEST--
+stdlib fputcsv() — empty escape/enclosure ValueError parity (#4530, ext/standard/file.c)
+--FILE--
+<?php
+$fp = fopen('php://memory', 'r+');
+foreach ([
+    ['escape' => ''],
+    ['enclosure' => ''],
+    ['enclosure' => 'ab'],
+    ['separator' => ''],
+    ['escape' => 'ab'],
+] as $case) {
+    try {
+        fputcsv($fp, ['a'], $case['separator'] ?? ',', $case['enclosure'] ?? '"', $case['escape'] ?? '\\');
+        echo "no throw\n";
+    } catch (Throwable $e) {
+        echo get_class($e), ': ', $e->getMessage(), "\n";
+    }
+}
+--EXPECT--
+no throw
+ValueError: fputcsv(): Argument #4 ($enclosure) must be a single character
+ValueError: fputcsv(): Argument #4 ($enclosure) must be a single character
+ValueError: fputcsv(): Argument #3 ($separator) must be a single character
+ValueError: fputcsv(): Argument #5 ($escape) must be empty or a single character
diff --git a/test/compliance/cases/stdlib/fputcsv_escape_jit.phpt b/test/compliance/cases/stdlib/fputcsv_escape_jit.phpt
new file mode 100644
index 00000000000..5b99db099b3
--- /dev/null
+++ b/test/compliance/cases/stdlib/fputcsv_escape_jit.phpt
@@ -0,0 +1,14 @@
+--TEST--
+stdlib fputcsv() JIT — empty enclosure ValueError (#4530, ext/standard/file.c)
+--JIT--
+--FILE--
+<?php
+$fp = fopen('php://memory', 'r+');
+try {
+    fputcsv($fp, ['a'], ',', '', '\\');
+    echo "no throw\n";
+} catch (Throwable $e) {
+    echo get_class($e), ': ', $e->getMessage(), "\n";
+}
+--EXPECT--
+ValueError: fputcsv(): Argument #4 ($enclosure) must be a single character
diff --git a/test/fixtures/aot/compile-only/fputcsv_escape.php b/test/fixtures/aot/compile-only/fputcsv_escape.php
new file mode 100644
index 00000000000..cf0bf55e2a2
--- /dev/null
+++ b/test/fixtures/aot/compile-only/fputcsv_escape.php
@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+// Compile-only (#4530): fputcsv() CSV option ValueError lowering for AOT lint.
+$fp = fopen('php://memory', 'r+');
+try {
+    fputcsv($fp, ['a'], ',', '', '\\');
+} catch (Throwable $e) {
+    echo get_class($e), ': ', $e->getMessage(), "\n";
+}
diff --git a/test/unit/FputcsvEscapeJitCompileTest.php b/test/unit/FputcsvEscapeJitCompileTest.php
new file mode 100644
index 00000000000..3753506c67a
--- /dev/null
+++ b/test/unit/FputcsvEscapeJitCompileTest.php
@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PHPCompiler;
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * AOT lint verify for fputcsv() delimiter/enclosure/escape ValueError (#4530).
+ *
+ * php-src: ext/standard/file.c — PHP_FUNCTION(fputcsv)
+ */
+final class FputcsvEscapeJitCompileTest extends TestCase
+{
+    public function testFputcsvEscapeAotLint(): void
+    {
+        $root = dirname(__DIR__, 2);
+        $bin = realpath($root.'/bin/compile.php');
+        $this->assertNotFalse($bin);
+        $target = $root.'/test/fixtures/aot/compile-only/fputcsv_escape.php';
+        $cmd = [PHP_BINARY, $bin, '-l', $target];
+        $descriptorSpec = [
+            0 => ['pipe', 'r'],
+            1 => ['pipe', 'w'],
+            2 => ['pipe', 'w'],
+        ];
+        $proc = proc_open($cmd, $descriptorSpec, $pipes, $root);
+        $this->assertIsResource($proc);
+        fclose($pipes[0]);
+        fclose($pipes[1]);
+        $stderr = stream_get_contents($pipes[2]);
+        fclose($pipes[2]);
+        $exit = proc_close($proc);
+        $this->assertSame(
+            0,
+            $exit,
+            trim($stderr !== false ? $stderr : '')."\n".'compile.php -l failed for fputcsv escape probe (#4530)'
+        );
+    }
+}