Preview:
$globalVar = 42;

function modifyGlobalVar() {
    // Incorrect: $globalVar here would create a new local variable
    $globalVar = 10;
    echo $globalVar; // Output: 10 (local variable)
}

modifyGlobalVar();
echo $globalVar; // Output: 42 (global variable is not modified)
downloadDownload PNG downloadDownload JPEG downloadDownload SVG

Tip: You can change the style, width & colours of the snippet with the inspect tool before clicking Download!

Click to optimize width for Twitter