documentclass[tikz, xcolor={svgnames}, aspectratio=43]{beamer}

usepackage{minted}
usepackage{tikz}

usetikzlibrary{shapes}

begin{document}
    begin{minted}[
        autogobble,
        escapeinside=||,
        fontsize=scriptsize,
        breaklines
    ]{php}
        <?php
            $dbhost = 'localhost';
            $dbuser = 'root';
            $dbpass = 'password';
            $dbname = 'STUDENTSREG';
            $conn = new mysqli ($dbhost, $dbuser, $dbpass, $dbname);
            if($conn->connect_error ) {
                die('Could not connect: ' . $conn->connect_error);
            }
            //prepare and bind
            $stmt = $conn->prepare("INSERT INTO STUDENT (SID, SNAME, EMAIL) VLAUES (?, ?, ?) ");
            $stmt->bind_param("sss",$id, $name, $email); |tikz node (sink) {dasfkj} ;|
            //set parameters and execute
            $id = 1004; $name = "JKL"; $email="jkl@jkl.com";
            $stmt->execute();

            $id = 1005; $name = "MNO"; $email="mno@mno.com";
            $stmt->execute();
            echo "Entered records successfullyn";
            $stmt->close();
            $conn->close();
        ?>
    end{minted}
end{document}

! Package tikz Error: A node must have a (possibly empty) label text.

See the tikz package documentation for explanation.
Type  H <return>  for immediate help.
 ...

l.13 ... }PYG{esc}{tikz node (sink) {dasfkj} ;}

documentclass[tikz, xcolor={svgnames}, aspectratio=43]{beamer}

usepackage{minted}
usepackage{tikz}

usetikzlibrary{shapes}

begin{document}
    begingroup
    catcode`!=active
    def!#1#2!{tikz{node (#1) {#2};}}
    begin{minted}[
        autogobble,
        escapeinside=||,
        fontsize=scriptsize,
        breaklines
    ]{php}
        <?php
            $dbhost = 'localhost';
            $dbuser = 'root';
            $dbpass = 'password';
            $dbname = 'STUDENTSREG';
            $conn = new mysqli ($dbhost, $dbuser, $dbpass, $dbname);
            if($conn->connect_error ) {
                die('Could not connect: ' . $conn->connect_error);
            }
            //prepare and bind
            $stmt = $conn->prepare("INSERT INTO STUDENT (SID, SNAME, EMAIL) VLAUES (?, ?, ?) ");
            $stmt->bind_param("sss",$id, $name, $email); |!{sink}{dasfkj}!|
            //set parameters and execute
            $id = 1004; $name = "JKL"; $email="jkl@jkl.com";
            $stmt->execute();

            $id = 1005; $name = "MNO"; $email="mno@mno.com";
            $stmt->execute();
            echo "Entered records successfullyn";
            $stmt->close();
            $conn->close();
        ?>
    end{minted}
    endgroup
end{document}