Find bugIntermediate4 questions

Find the bug: everyday PHP

Four short snippets that look right and are not.

01This prints "not found" even though "apple" contains "a". Why?
```
<?php

if (strpos("apple", "a")) {
    echo "found";
} else {
    echo "not found";
}
```
astrpos() is case sensitivebstrpos() returns the position 0, which is falsy; compare with !== falsecThe arguments are in the wrong orderdstrpos() only accepts single quoted strings
02This prints 1, not 2. Why?
```
<?php

function addItem(array $items, string $item): void
{
    $items[] = $item;
}

$cart = ["apple"];
addItem($cart, "pear");

echo count($cart);
```
aArrays are passed by value, so the function changes its own copybcount() does not count string valuescA void function cannot modify its arguments, even by referencedThe [] operator only works on empty arrays
03The developer expected 2025-02-28. What does this actually print?
```
<?php

echo date("Y-m-d", strtotime("+1 month", strtotime("2025-01-31")));
```
a2025-02-28b2025-02-31c2025-03-01d2025-03-03
04Calling double("abc") here ends in an uncaught fatal error instead of printing "caught". Why?
```
<?php

function double(int $n): int
{
    return $n * 2;
}

try {
    echo double("abc");
} catch (Exception $e) {
    echo "caught";
}
```
atry/catch does not work around function callsbA TypeError is thrown, and TypeError extends Error, not Exception; catch Throwable or TypeErrorcThe catch block must come before the try blockdecho cannot be used inside a try block

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