Display a php function in jquery onblur

I have html code:

<input type="text" id="email" onblur="<?php validate_email_input($email); ?>" />

And now I want to display while onblur:

function validate_email_input($email)
{
    if(!prawidlowy_email($email)) {
        throw new exception('<div id="#okno_bledu_rejestracji" style="background: #FBE3E4 url('.$errw.') no-repeat;background-position: 7px 7px;color:#E64D19;"><p>Kombinacja znaków w polu e-mail jest niepoprawna!</p></div>');
    }
    elseif(strlen($email) > 44) {
        throw new exception('<div id="#okno_bledu_rejestracji" style="background: #FBE3E4 url('.$errw.') no-repeat;background-position: 7px 7px;color:#E64D19;"><p>Pole email musi zawierać maksymalnie 44 znaki!</p></div>');
    }
    elseif(strlen($email) < 6) {
        throw new exception('<div id="#okno_bledu_rejestracji" style="background: #FBE3E4 url('.$errw.') no-repeat;background-position: 7px 7px;color:#E64D19;"><p>Pole email musi zawierać minimum 6 znaków!</p></div>');
    }
}

And for displaying it on the same page, but in div named okno_bledu_rejestracji I use this HTML code:

<div id="okno_bledu_rejestracji">validate error box</div>

And this JQ code, which is displaying after click form's submit button, which its name is #zarejestruj_sie:

$(document).ready( function() {
    $("#zarejestruj_sie").click( function() {

            $.post( $("#formularz_rejestracji").attr("action"), $("#formularz_rejestracji :input").serializeArray(), function(info) {
                $("#okno_bledu_rejestracji").empty();
                $("#okno_bledu_rejestracji").html(info);
            });

            $("#formularz_rejestracji").submit( function() {
                return false;
            });         
    });
});

Now I want to display a php function:

function validate_email_input($email)
    {
        if(!prawidlowy_email($email)) {
            throw new exception('<div id="#okno_bledu_rejestracji" style="background: #FBE3E4 url('.$errw.') no-repeat;background-position: 7px 7px;color:#E64D19;"><p>Kombinacja znaków w polu e-mail jest niepoprawna!</p></div>');
        }
        elseif(strlen($email) > 44) {
            throw new exception('<div id="#okno_bledu_rejestracji" style="background: #FBE3E4 url('.$errw.') no-repeat;background-position: 7px 7px;color:#E64D19;"><p>Pole email musi zawierać maksymalnie 44 znaki!</p></div>');
        }
        elseif(strlen($email) < 6) {
            throw new exception('<div id="#okno_bledu_rejestracji" style="background: #FBE3E4 url('.$errw.') no-repeat;background-position: 7px 7px;color:#E64D19;"><p>Pole email musi zawierać minimum 6 znaków!</p></div>');
        }
    }

In div named okno_bledu_rejestracji after onblur input, which id is email.

I give thumbs for help. thanks.

This isn't "normally" possible. PHP is executed by the server before the page is served to the client. The client doesn't understand your PHP code.

That being said, there is a way to achieve this with PHP. Using Ajax, it's possible to query the server with the email and get a response back from the server. Typically you'll get a response back in JSON.

With jQuery, the following code would do just that:

$(document).ready( function() {
    $("#email").mouseup(function() {
        var email = $(this).val(),
            url = "api/myfunction?email=" + email;

        $.get(url, function(data) {
            // We succeeded!  data contains your response.
        });
    });
});