Fgets() but on a string instead of a file?

I can do the following:

$fopen = fopen($file_name, '开发者_JAVA技巧r');
$data = fgets($fopen, 16384);
fclose($fopen);

But is their any way I could emulate the same functionality but on a string (instead of using a file name)?

$string = file_get_contents($file_name); /* just for demonstration purposes */
$data = /* do something here...*/

Hope that made sense.

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There are lots of function defined for String manipulation here. You can choose any of them which fulfills your requirements.

Probably you need substr()

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This manual page documents a custom stream wrapper that can be used to give

read/write access to a named global variable using standard filesystem stream functions such as fread(). The var:// protocol implemented below, given the URL "var://foo" will read/write data to/from $GLOBALS["foo"].

This would allow you to do:

$fp = fopen('var://string', 'r');
$data = fgets($fp, 16384);

to 'fread() from $string'.

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$parts = explode("\n", $data);

foreach ($parts as $key => $value) {  
    $parts[$key] = substr($parts[$key], 0, 16384);  
}

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I like internal pointers too. You can always:

$fp = fopen('php://memory', 'r+');
fwrite($fp, $string);
rewind($fp);

I also saw a one-liner equivalent that goes like this:

$fp = fopen('data://text/plain;base64,' . base64_encode($string), 'r');

... which is elegant but has the caveat of a redundant encoding step.

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$string = file_get_contents($file_name); /* just for demonstration purposes */
$data = substr($string, 0, 16384);

Or maybe do you want ton consume a part of the string for each call to the function?

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Humm... Not sure what you want but have you looked into substr()?