<?php

	function removerAspas($str){
		$aspaInicio  = substr($str, 0, 1) == "'" ? "'" : '';
		$aspaFim = substr($str, -1, 1)  == "'" ? "'" : '';
		$strLimpa = str_replace("'", '', $str);
		
		return sprintf("%s%s%s", $aspaInicio, $strLimpa, $aspaFim);
	}

	$str = "'Texto e pala'vras'";
	
	echo removerAspas("'Texto e pala'vras'") .PHP_EOL;
	echo removerAspas("Texto e pala'vras'") .PHP_EOL;
	echo removerAspas("'Texto e pala'vras") .PHP_EOL;
	echo removerAspas("Te'x'to' 'e' pala'vras") .PHP_EOL;