Add dedicated test

Author: nikic

Zend/tests/string_to_number_comparison.phpt

@@ -0,0 +1,92 @@
+--TEST--
+String to number comparison
+--FILE--
+<?php
+
+// This tests the examples from the RFC.
+
+function format($val) {
+    if (is_float($val)) {
+        if (is_nan($val)) return "NAN";
+        if ($val == INF) return "INF";
+        if ($val == -INF) return "-INF";
+    }
+    return json_encode($val);
+}
+
+function compare_eq($val1, $val2) {
+    echo format($val1), " == ", format($val2), ": ", format($val1 == $val2), "\n";
+}
+
+function compare_3way($val1, $val2) {
+    echo format($val1), " <=> ", format($val2), ": ", format($val1 <=> $val2), "\n";
+}
+
+compare_eq(42, "000042");
+compare_eq(42, "42.0");
+compare_eq(42.0, "+42.0E0");
+compare_eq(0, "0e214987142012");
+echo "\n";
+
+compare_eq("42", "000042");
+compare_eq("42", "42.0");
+compare_eq("42.0", "+42.0E0");
+compare_eq("0", "0e214987142012");
+echo "\n";
+
+compare_eq(42, "   42");
+compare_eq(42, "42   ");
+compare_eq(42, "42abc");
+compare_eq(42, "abc42");
+compare_eq( 0, "abc42");
+echo "\n";
+
+compare_eq(INF, "INF");
+compare_eq(-INF, "-INF");
+compare_eq(NAN, "NAN");
+compare_eq(INF, "1e1000");
+compare_eq(-INF, "-1e1000");
+echo "\n";
+
+$float = 1.75;
+ 
+echo "precision=14:\n";
+ini_set('precision', 14);
+compare_3way($float, "1.75abc");
+compare_3way((string) $float, "1.75abc");
+ 
+echo "precision=0:\n";
+ini_set('precision', 0);
+compare_3way($float, "1.75abc");
+compare_3way((string) $float, "1.75abc");
+
+?>
+--EXPECT--
+42 == "000042": true
+42 == "42.0": true
+42 == "+42.0E0": true
+0 == "0e214987142012": true
+
+"42" == "000042": true
+"42" == "42.0": true
+"42.0" == "+42.0E0": true
+"0" == "0e214987142012": true
+
+42 == "   42": true
+42 == "42   ": false
+42 == "42abc": false
+42 == "abc42": false
+0 == "abc42": false
+
+INF == "INF": true
+-INF == "-INF": true
+NAN == "NAN": false
+INF == "1e1000": true
+-INF == "-1e1000": true
+
+precision=14:
+1.75 <=> "1.75abc": -1
+"1.75" <=> "1.75abc": -1
+precision=0:
+1.75 <=> "1.75abc": 1
+"2" <=> "1.75abc": 1