Difference between ' and " in tcpdf or php -

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i m little bit confuse in ' , ". im trying create pdf.

code 

txt='<input type="checkbox" name="product[]" value="product fault/failure"'.if(in_array("product fault/failure",$myarray)) { .' checked="checked" '.} .'>product fault/failure'

when executing this,getting syntax error.i dnt know why write in "" or '' quote , why cant write <?php ?>

'.....'.if(in_array("product fault/failure",$myarray)) { .' checked="checked" '.} .'...'

this wrong. can't concatenate if statement that.

'.....'.(in_array("product fault/failure",$myarray) ? ' checked' : '').'...'

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