Campo Grande-MS., 4 de Setembro de 2010

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<?php
$file=fopen("contato.txt","r") or exit("Nao foi possivel abrir o arquivo!");
?>

Mais opções para manipulação de arquivos:

Modes	Description
r	Read only. Starts at the beginning of the file
r+	Read/Write. Starts at the beginning of the file
w	Write only. Opens and clears the contents of file; or creates a new file if it doesnt exist
w+	Read/Write. Opens and clears the contents of file; or creates a new file if it doesnt exist
a	Append. Opens and writes to the end of the file or creates a new file if it doesnt exist
a+	Read/Append. Preserves file content by writing to the end of the file
x	Write only. Creates a new file. Returns FALSE and an error if file already exists
x+	Read/Write. Creates a new file. Returns FALSE and an error if file already exists

Note: se a função fopen() nao conseguir abrir o arquivo, será retornado 0 (false).