JuniorTheoryCommon

What does the program print (lines separated by spaces)?

PHP

<?php

var_dump(1 == '1');
var_dump(1 === '1');
var_dump(0 == 'a');
var_dump('1' == '01');

bool(true) bool(false) bool(false) bool(true)

Expecting 0 == 'a' to be true, as in PHP 7: since PHP 8 a number compared with a non-numeric string is turned into a string, and '0' is not 'a'.
Expecting '1' == '01' to be false because the strings differ: under == two numeric strings compare as numbers, and only === compares them as text.

JuniorTheoryCommon

PHP

<?php

var_dump(1 == '1');
var_dump(1 === '1');
var_dump(0 == 'a');
var_dump('1' == '01');

bool(true) bool(false) bool(false) bool(true)

Expecting 0 == 'a' to be true, as in PHP 7: since PHP 8 a number compared with a non-numeric string is turned into a string, and '0' is not 'a'.
Expecting '1' == '01' to be false because the strings differ: under == two numeric strings compare as numbers, and only === compares them as text.