Stdlib: abs/floor/ceil Reflection/named param num (#23259)

lib/BuiltinParamNames.php

@@ -504,6 +504,11 @@ public static function forFunction(string $name): ?array
                 return ['filename', 'line'];
             case 'number_format':
                 return ['num', 'decimals', 'decimal_separator', 'thousands_separator'];
+            // php-src ext/standard/basic_functions.stub.php — InternalArgInfo still says number (#23259)
+            case 'abs':
+            case 'floor':
+            case 'ceil':
+                return ['num'];
             case 'round':
                 return ['num', 'precision', 'mode'];
             case 'frexp':

test/compliance/cases/stdlib/named_args_abs_floor_ceil.phpt

@@ -0,0 +1,30 @@
+--TEST--
+abs / floor / ceil named num argument (VM, issue #23259)
+--FILE--
+<?php
+var_export(abs(num: -3));
+echo PHP_EOL;
+var_export(floor(num: 1.5));
+echo PHP_EOL;
+var_export(ceil(num: 1.2));
+echo PHP_EOL;
+foreach (['abs', 'floor', 'ceil'] as $fn) {
+    $rf = new ReflectionFunction($fn);
+    foreach ($rf->getParameters() as $p) {
+        echo $fn, ':', $p->getName(), PHP_EOL;
+    }
+}
+try {
+    abs(number: -3);
+    echo "number accepted\n";
+} catch (Throwable $e) {
+    echo $e->getMessage(), PHP_EOL;
+}
+--EXPECT--
+3
+1.0
+2.0
+abs:num
+floor:num
+ceil:num
+Unknown named parameter $number

test/compliance/cases/stdlib/named_args_abs_floor_ceil_jit.phpt

@@ -0,0 +1,31 @@
+--TEST--
+abs / floor / ceil named num argument (JIT, issue #23259)
+--JIT--
+--FILE--
+<?php
+var_export(abs(num: -3));
+echo PHP_EOL;
+var_export(floor(num: 1.5));
+echo PHP_EOL;
+var_export(ceil(num: 1.2));
+echo PHP_EOL;
+foreach (['abs', 'floor', 'ceil'] as $fn) {
+    $rf = new ReflectionFunction($fn);
+    foreach ($rf->getParameters() as $p) {
+        echo $fn, ':', $p->getName(), PHP_EOL;
+    }
+}
+try {
+    abs(number: -3);
+    echo "number accepted\n";
+} catch (Throwable $e) {
+    echo $e->getMessage(), PHP_EOL;
+}
+--EXPECT--
+3
+1.0
+2.0
+abs:num
+floor:num
+ceil:num
+Unknown named parameter $number

test/fixtures/aot/cases/abs_floor_ceil_named_params.phpt

@@ -0,0 +1,11 @@
+--TEST--
+AOT: abs() named num: argument (#23259)
+--FILE--
+<?php
+echo abs(num: -3), "\n";
+echo abs(num: 0), "\n";
+echo abs(-3), "\n";
+--EXPECT--
+3
+0
+3

test/repro/issue_23259_abs_floor_ceil_named.php

@@ -0,0 +1,35 @@
+<?php
+// Repro #23259 — abs/floor/ceil Zend stub named parameter (num)
+$checks = [];
+foreach (['abs', 'floor', 'ceil'] as $fn) {
+    $names = [];
+    foreach ((new ReflectionFunction($fn))->getParameters() as $p) {
+        $names[] = $p->getName();
+    }
+    $checks[] = ['num'] === $names;
+    try {
+        if ('abs' === $fn) {
+            $checks[] = 3 === abs(num: -3) && 3 === abs(-3);
+        } elseif ('floor' === $fn) {
+            $checks[] = 1.0 === floor(num: 1.5) && 1.0 === floor(1.5);
+        } else {
+            $checks[] = 2.0 === ceil(num: 1.2) && 2.0 === ceil(1.2);
+        }
+    } catch (Throwable $e) {
+        $checks[] = false;
+    }
+    try {
+        if ('abs' === $fn) {
+            abs(number: -3);
+        } elseif ('floor' === $fn) {
+            floor(number: 1.5);
+        } else {
+            ceil(number: 1.2);
+        }
+        $checks[] = false;
+    } catch (Error $e) {
+        $checks[] = str_contains($e->getMessage(), 'Unknown named parameter $number');
+    }
+}
+
+echo (!in_array(false, $checks, true)) ? "ok\n" : "fail\n";

test/repro/issue_23259_abs_floor_ceil_named_aot.php

@@ -0,0 +1,4 @@
+<?php
+// AOT probe #23259 — abs named num: (floor/ceil AOT positional already return 0 on master)
+echo abs(num: -3), "\n";
+echo abs(-3), "\n";

test/unit/BuiltinParamNamesAliasTest.php

@@ -896,6 +896,17 @@ public function testRoundNamedParameters(): void
         self::assertSame(2, BuiltinParamNames::lookupNamedParamIndex($names, 'mode', 'round'));
     }
 
+    /** @covers issue #23259 */
+    public function testAbsFloorCeilZendStubNamedParams(): void
+    {
+        foreach (['abs', 'floor', 'ceil'] as $fn) {
+            $names = BuiltinParamNames::forFunction($fn);
+            self::assertSame(['num'], $names, $fn);
+            self::assertSame(0, BuiltinParamNames::lookupNamedParamIndex($names, 'num', $fn), $fn);
+            self::assertFalse(BuiltinParamNames::lookupNamedParamIndex($names, 'number', $fn), $fn);
+        }
+    }
+
     /** @covers issue #11785 / #25166 */
     public function testDateTimeClassMethodNamedParameters(): void
     {