string compare int value trap in php

If string compare with an integer, php will evaluate string to integer intval() and compare it with that integer.

php

if('test' != 0) {
    echo "true";
} else {
    echo "false"; // return false
}
if('0test' != 0) {
    echo "true";
} else {
    echo "false"; // return false
}
if('1test' != 0) {
    echo "true"; // return true
} else {
    echo "false";
}