- var_dump: documentation ( source)
- urldecode: documentation ( source)
- str_replace: documentation ( source)
<?php
$bio = '1390TkZSI/8AFpgAyABrAWsBAAD/kAACAQb/EwZ0gYAJCo6OkoAUBIkRyoAYBoGE2QASB45qGYEGBpTqOYEDCY0deoETD39mkoEJCpNc+gELFIdGQsIMb3wlWYINQXataYIYBYcwOcMHDYaqSsMUHHYuWoMFDIiwkcMICoSlkYMUZXOemcMTQnAyooMDB4sAAAABBCpBAg0ABwAEAAD/EHaBwAkKjo2KABQEjIjhQBIHi2oRAQcGk+ZBQQMJiyCCwRMOf2WaQQkKlVYKggoWiTxSggxTfax5whgEhjAxgwcOhKg6gxQWdC1yAwYLjamZQwkJfsGZwxRscjOqgwMIjAAA-119ATkZSI/kAFpgAyABrAWsBAAD/mgACAQb/EQYRYQAVBpuEcYASC5wDkoAQCpftmQAEB4tl0YADDIT+2oALCY/wAcEFDY54AkEKCpIKgoENFJAekQEVCJzlmQEGCW1iucEJGHIl2YEUB6EteQISDY1M6YIOIno8MQMYCYdIWYMVCoUAAAABBGCRQg4ABwAEAAD/EQ9hwBQGm4Z5ABMKnAiSABEJmO2hwAMHiWbJAAQLh/3pgAsJkHgCAQoKk+0JgQUMixhBgRgHjgyCwQ0UkhyJwRQIm+KpgQUIaWGxAQoUcyLRQRQIoCtxwhEMijQpwxcJhz1BQxUKhAAA';
$bio = urldecode(str_replace('/', '\\', $bio));
var_dump($bio);
?>