Para la mayoría, las comillas simples y dobles, en PHP, son iguales. Sin embargo presentan diferencias fundamentales. Usando comillas dobles existen más caracteres especiales: \n \r \t \\ \$ \" \[0-7]{1,3} \x[0-9A-Fa-f]{1,2} mientras que con comillas simples sólo tenemos \\ y \'.
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