fflush

18.18. Flushing Output to a File

18.18.1. Problem
You want to force all buffered data to be written to a filehandle.

18.18.2. Solution
Use fflush( ):

    fwrite($fh,'There are twelve pumpkins in my house.');
    fflush($fh);

This ensures that "There are twelve pumpkins in my house." is written to $fh.

18.18.3. Discussion
To be more efficient, system I/O libraries generally don't write something to a file when you tell them to. Instead, they batch the writes together in a buffer and save all of them to disk at the same time. Using fflush( ) forces anything pending in the write buffer to be actually written to disk.
Flushing output can be particularly helpful when generating an access or activity log. Calling fflush( ) after each message to log file makes sure that any person or program monitoring the log file sees the message as soon as possible.

18.18.4. See Also
Documentation on fflush( ) at http://www.php.net/fflush.

Questions: File functions

What is the output of following code?
<?php
$name = 'fpassthru.txt';

$str = <<<EOF
FOO
BAR
BAZ
EOF;

$fp = fopen($name, 'w');
fwrite($fp, $str);
fclose($fp);

$fp = fopen($name, 'r');
fgets($fp);
fpassthru($fp);
fclose($fp);
?>

a) FOO BAR
b) BAR BAZ
c) FOO BAZ
d) BAR FOO

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সাব প্যাটার্ন বাদ দেওয়া এটা দ্বারা ?:

Remove subpattern from array $matches

আগে

Array
(
    [0] => xxxxzzzz
    [1] => xxxx   // remove this by ?: 
    [2] => zzzz
)

$str = "xxxxzzzz";

preg_match("/(x+)(z+)/",  $str, $matches);

print_r($matches); 

পরে 

Array
(
    [0] => xxxxzzzz
    [1] => zzzz
)

strtok

strtok বিভিন্ন ধরনের দেলিমেতের থাকে এমন স্ট্রিং কে টোকেন হিসাবে রিটার্ন করে।  repeated delimiter থাকলে প্রতি একবার রান করলে একটা টোকেন স্ট্রিং রিটার্ন করে, এভাবে পর পর রান করলে পরবার একটা করে রিটার্ন পাওয়া যাবে সংশ্লিষ্ট ওই delimiter জন্য। সুধু প্রথমবার স্ট্রিং দিতে হই, তারপর শুধু delimiter token দিলেই হয়। প্রতি executioner পর এটা কারেন্ট position ধরে রাখে।

var_dump(strtok('a1/a2/a3/a4', '/')); //a1
var_dump(strtok('/')); // a2
var_dump(strtok('/')); // a3
var_dump(strtok('/')); // a4
var_dump(strtok('/')); // bool(false) , at 5th execution

string(2) "a1"
string(2) "a2"
string(2) "a3"
string(2) "a4"
bool(false)

<?php
$string = "This is\tan example\nstring";/* Use tab and newline as tokenizing characters as well  */$tok = strtok($string, " \n\t");

while ($tok !== false) {
    echo "Word=$tok<br />";
    $tok = strtok(" \n\t");
}?>

preg_replace_callback_array

$subject = 'Aaaaaa Bbb';
preg_replace_callback_array(
    [
        '~[a]+~i' => function ($match) {
            echo strlen($match[0]), ' matches for "a" found', PHP_EOL;
        },
        '~[b]+~i' => function ($match) {
            echo strlen($match[0]), ' matches for "b" found', PHP_EOL;
        }
    ],
    $subject);

6 matches for "a" found
3 matches for "b" found

preg_grep

// return all array elements
// containing floating point numbers
$array = array(120, 256.2, 985, 254, 654, 85.24, 65.9, 87);
$fl_array = preg_grep("/^(\d+)?\.\d+$/", $array);

print_r($fl_array);

Array
(
    [1] => 256.2
    [5] => 85.24
    [6] => 65.9
)