zend_extension = C:\php\ext\php_xdebug-2.6.1-7.2-vc15-x86_64.dll
xdebug.remote_enable = 1
xdebug.remote_autostart = 1

    "php.validate.enable": true,
    "php.validate.executablePath": "C:\\php\\php.exe",
    "php.validate.run": "onType"

<?php
$a=1;
phpinfo();
printf($a);
?>

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Listen for XDebug",
            "type": "php",
            "request": "launch",
            "port": 9000
        },
        {
            "name": "Launch currently open script",
            "type": "php",
            "request": "launch",
            "program": "${file}",
            "cwd": "${fileDirname}",
            "port": 9000
        }
    ]
}

php index.php