Fix #71152: mt_rand() returns the different values from original mt19937ar.c

1 files changed, 53 insertions, 0 deletions

diff --git a/ext/standard/tests/math/mt_rand_value.phpt b/ext/standard/tests/math/mt_rand_value.phpt
new file mode 100644
index 0000000000..eeb009e4b4
--- /dev/null
+++ b/ext/standard/tests/math/mt_rand_value.phpt
@@ -0,0 +1,53 @@
+--TEST--
+Test mt_rand() - returns the exact same values as mt19937ar.c
+--FILE--
+<?php
+
+mt_srand(12345678);
+
+for ($i=0; $i<16; $i++) {
+    echo mt_rand().PHP_EOL;
+}
+echo PHP_EOL;
+
+$x = 0;
+for ($i=0; $i<1024; $i++) {
+    $x ^= mt_rand();
+}
+echo $x.PHP_EOL;
+
+/*
+excpect values are obtained from original mt19937ar.c as follows:
+
+int i, x;
+init_genrand(12345678);
+for (i=0; i<16; i++) {
+    printf("%d\n", genrand_int31());
+}
+printf("\n");
+x = 0;
+for (i=0; i<1024; i++) {
+    x ^= genrand_int31();
+}
+printf("%d\n", x);
+*/
+?>
+--EXPECTF--
+527860569
+1711027313
+1280820687
+688176834
+770499160
+412773096
+813703253
+898651287
+52508912
+757323740
+511765911
+274407457
+833082629
+1923803667
+1461450755
+1301698200
+
+1612214270