what is the symbol for a blank space in php coding?

im trying to do a replace code for symbols, i want to replace the symbol of
:
to a blank space
what i have come up with is
$recipetitle = str_replace(":", '"', $src);
i dont want quotes in place of it, rather have a blank space, any know what i put there?
if any know of the complete code i would use for this whole process that would be a huge help too, im kinda just learning this out myself and im kinda lost.
 
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