<div>
Works fine; thank you!<br />
Best regards.
</div>


<div>
<div class="content wysiwyg-content">
The mathematical operators are easy to use and everybody knows:<br />
<br />
$a=10<br />
$b=1<br />
<br />
$a + $b = 11<br />
$a - $b = 9<br />
<br />
<br />
However, if variables are strings rather than numbers, sometimes is confusing...<br />
<br />
<br />
$a = &quot;AAAAAAAZZZZZZZZZZZZZZZ&quot;<br />
$b = &quot;ZZZZZZZZZZZZZZZ&quot;<br />
<br />
$a &amp;&nbsp;$b (the correct; not $a + $b because no numbers!) = &quot;AAAAAAAZZZZZZZZZZZZZZZAAA<wbr />AAAAZZZZZZ<wbr />ZZZZZZZZZ&quot;<wbr /><br />
<br />
<br />
My question is - How to subtract characters using string variables?:<br />
<br />
«$a - $b» = &quot;AAAAAAA&quot; (what is the correct expression, instead of «$a - $b»?)<br />
<br />
<br />
Regards.
</div>
</div>


The mathematical operators are easy to use and everybody knows:

$a=10
$b=1

$a + $b = 11
$a - $b = 9


However, if variables are strings rather than numbers, sometimes is confusing...


$a = "AAAAAAAZZZZZZZZZZZZZZZ"
$b = "ZZZZZZZZZZZZZZZ"

$a & $b (the correct; not $a + $b because no numbers!) = "AAAAAAAZZZZZZZZZZZZZZZAAAAAAAZZZZZZZZZZZZZZZ"


My question is - How to subtract characters using string variables?:

«$a - $b» = "AAAAAAA" (what is the correct expression, instead of «$a - $b»?)


Regards.

How to &quot;subtract strings&quot;?

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How to &quot;subtract strings&quot;?

How to "subtract strings"?