WordPress Get Image Source Function

get_image_src

<?php

function get_image_src( $id = 0, $size = '', $default_id = 50 ) {
    $src = '';

    // get src of attachment id

    if ( $id > 0 ) {
        list( $src, $width, $height ) = wp_get_attachment_image_src( $id,  $size );
    }

    // if no src is found and there is a default attachment id, get the source of the default image

    if ( ! strlen( $src ) && $default_id > 0 ) {
        list( $src, $width, $height ) = wp_get_attachment_image_src( $default_id,  $size );
    }
    return $src;
}

?>