How to modify txt file in php

How to modify the txt file in php: first use the fopen() function to open the txt file; then use the fputs() function to write the content into the opened file. The fputs() function stops when it reaches the specified length or reaches the end of the file.

fputs() function writes the contents to an open file. The function will stop running when it reaches the specified length or reaches the end of file (EOF), whichever comes first.

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If the function is successfully executed, the number of bytes written will be returned. On failure, returns FALSE.

Syntax:

fputs(file,string,length)

Parameters:

• ##file Required. Specifies the open file to be written to.

• #string Required. Specifies the string to be written to the open file.

• #length Optional. Specifies the maximum number of bytes to be written.

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$path="wifi_customer_settings.txt";
$wifissid2=$_POST['wifissid'];
$wifipwd2=$_POST['wifipwd'];
$arr=array("wifiSSID=".$wifissid2,"\n","wifiPWD=".$wifipwd2);
$fp=fopen($path, 'w');
fputs($fp,$arr[0]);
fputs($fp,$arr[1]);
fputs($fp,$arr[2]);
fclose($fp);

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