Concatenate a string with the output of a php function as a parameter of anouther function

Question

When I call a function mainfunc() I want to put an explicit value near to the output of a function as a parameter of mainfunc(). I want to do someting like mainfunc('foo'.LaTeX());.

But, when I do that, I get the output of LaTeX() before “foo”, it exactly print me LaTeXfoo (the output of LaTeX() is LaTeX) and I got the same thing when I try to permute it like LaTeX() . foo.

So, this is the deffinition of the function LaTeX() :

function LaTeX()
{
    ?><span class="latex">L<spu>a</sup>T<sub>e</sub>X</span><?php
}

So, what can I do to make mainfunc exactly receive fooLaTeX by using LaTeX() function, please?

This should be moved to tex.stackexchange.com or StackOverflow. — William
– William, Commented Jul 27, 2014 at 11:47
StackOverflow, sure. But tex no, because it is a question about PHP, I use a PHP command to print the name of LaTeX correctly formatted but it could be another function. — fauve
– fauve, Commented Jul 27, 2014 at 15:18

Mario · Accepted Answer · 2014-07-27 12:37:52Z

2

The answer is simple:

Don't print (which is what happens if you close the PHP code and reopen).

The following two lines of code will essentially do the same thing (they're equivalent):

echo '<b>Hello World!</b>';

?><b>Hello World!</b><?php

Instead, work with return values:

function LaTeX()
{
    return '<span class="latex">L<sup>a</sup>T<sub>e</sub>X</span>';
}

This will create the behavior you're looking for. However, if you just plan on returning a fixed string, better define a constant:

define(LaTeX, '<span class="latex">L<sup>a</sup>T<sub>e</sub>X</span>');

mainfunc('foo' . LaTeX);

edited Jul 27, 2014 at 12:37

answered Jul 27, 2014 at 12:12

Mario

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