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[2010-03-29 05:42 UTC] ssiangge at yahoo dot com dot sg
Description:
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When I want test the value(int 0) is or is not match with a string(string "text"), it return true! By right it should return false. Then I try on other value, it also return wrong result!
Test script:
---------------
<?php
$question = true;
if ("text" == $question) echo "text == $question => true<br />";
else echo "text == $question => false<br />";
$question = 0;
if ("text" == $question) echo "text == $question => true<br />";
else echo "text == $question => false<br />";
$question = 1;
if ("text" == $question) echo "text == $question => true<br />";
else echo "text == $question => false<br />";
$question = false;
if ("text" == $question) echo "text == $question => true<br />";
else echo "text == $question => false<br />";
?>
Expected result:
----------------
text == 1 => false
text == 0 => false
text == 1 => false
text == => false
Actual result:
--------------
text == 1 => true
text == 0 => true
text == 1 => false
text == => false
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Last updated: Thu Jul 10 19:01:34 2025 UTC |
I found answer from the user manual... hmmm.... # If you compare an integer with a string, the string is converted to a number. If you compare two numerical strings, they are compared as integers. These rules also apply to the switch statement. # <?php var_dump(0 == "a"); // 0 == 0 -> true var_dump("1" == "01"); // 1 == 1 -> true switch ("a") { case 0: echo "0"; break; case "a": // never reached because "a" is already matched with 0 echo "a"; break; } ?>