PHP fwrite function why i cannot write "$" character in fwrite -

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what problem in code? why cannot use "$" in fwrite function?

fwrite($dosya_index,"$al_".$bol_radiopart[1]." = $_post['".$bol_radiopart[1]."'];");

this because php variables interpolated in strings enclosed double quotes. means words starting $ sign in double quotes handled variables, , if such variable exists, value replaced within string. escape $ sign (\$) or use single quotes interpolation not applied.


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