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Asked: 2026-05-26T11:51:17+00:00

i wrote the following code… <?php $conn=mysql_connect(localhost,,); if($conn) echo connection established; mysql_select_db(moviesite); $que=select *

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i wrote the following code…

<?php

$conn=mysql_connect("localhost","","");
if($conn)
echo "connection established";

mysql_select_db("moviesite");

$que="select * from movie";
$result=mysql_query($que,$conn);
?>

<html>
<title>movie database</title>
<body>
<table border=1 align=center>
<th colspan=2>
PEOPLE<a href='movie.php?action=add & id='>[ADD]</a>
</th>

<?php
$ta_row=<<<eod
    <tr>
    <td>
    $mov_name
    </td>
    <td>
    <a href='movie.php?action=edit & id=$mov_id'>[EDIT]</a>
    <a href='movie.php?action=delete & id=$mov_id'>[DELETE]</a>
    <td>
    </tr>
eod;

while($row=mysql_fetch_array($result))
{
$mov_id=$row["id"];
$mov_name=$row["name"];
echo $ta_row;
}
?>

now the above code didnt print the name or the id of the movie(the fields were blank)…so i cut and paste $ta_row inside the while loop after the definition of $mov_id and $mov_name…this sorted out all problems…but my question is why did the code fail earlier…as it is i was outputting ta_row after defining $mov_id and $mov_name so if $ta_row is just a string its content variables should have got changed…why didnt they change?

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1 Answer

  1. Editorial Team

    Because a heredoc is just like any other string – it’s value is fixed when you declare it. If the variables $mov_id and $mov_name weren’t set when you declared $ta_row, you can’t use them in $ta_row.

    If you want to do something like you tried to do in the first place, you would have to use something like str_replace() or sprintf() – replace place-holders in the original string with the actual values you want to display.

    Consider this:

    $myVar = "Some string containing a $var";
$var = 'Variable';
echo $myVar;
// Outputs: Some string containing a

    Now this:

    $var = 'Variable';
$myVar = "Some string containing a $var";
echo $myVar;
// Outputs: Some string containing a Variable

    …Heredocs behave exactly like a double-quoted string (from this point of view, at least).

    Alternatively you could do this:

    $myVar = 'Some string containing a $var';
$var = 'Variable';
echo $myVar;
// Outputs: Some string containing a $var
echo str_replace('$var',$var,$myVar);
// Outputs: Some string containing a Variable

    …because $myVar is now single-quoted, $var appears in it literally. Then when you run str_replace(), it is replaced with the value of $var, instead of the literal string.

    It’s probably worth you re-reading this.

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