PHP 0 and string comparisons are true

$test 01= "Hello" if ($test 01==0) {echo "true"}else{echo "false"} The result of the output is true

PHP in judging the different types of time, you must use = = = to compare

When comparing different types of variables, PHP has an internal mechanism to convert and then compare them.

$test 01 = = 0

It should be to convert $test01 into an integer and then compare, so the result is true.

If you are not familiar with the internal mechanism, try to convert yourself to the same type before comparing.

The more secure approach is to use the = = = (three equals), so that not only compare the content, but also compare the type, if the type is inconsistent, press false to handle.

PHP 0 and string comparisons are true