Process any amounts of data. Any time

Juozas Kaziukėnas // juokaz.com // @juokaz

Juozas Kaziukėnas, Lithuanian

You can call me Joe

More info http://juokaz.com

Last year at PHPBNL12

Planking competition

The problem

CRON

PHP developers are lazy

Code should be lazy

file_get_contens

Buffering

Wait

Memory usage

Saw graph

Memory vs performance

Reading files

Line-by-line reading

$file_handle = fopen("myfile", "r");

while (!feof($file_handle)) {

$line = fgets($file_handle);

echo $line;

}

fclose($file_handle);

Line-by-line processing

$file_handle = fopen("myfile", "r");

while (!feof($file_handle)) {

$line = fgets($file_handle);

process($line);

}

fclose($file_handle);

XML

Read XML files

$z = new XMLReader;$z->open('data.xml');

$doc = new DOMDocument;

// move to the first <product /> nodewhile ($z->read() && $z->name !== 'product');

// now that we're at the right depth, hop to the next <product/> until the end of the treewhile ($z->name === 'product'){ // either one should work //$node = new SimpleXMLElement($z->readOuterXML()); $node = simplexml_import_dom($doc->importNode($z->expand(), true));

// now you can use $node without going insane about parsing var_dump($node->element_1);

// go to next <product /> $z->next('product');}

$z = new XMLReader;$z->open('data.xml');

$doc = new DOMDocument;

// move to the first <product /> nodewhile ($z->read() && $z->name !== 'product');

// now that we're at the right depth, hop to the next <product/> until the end of the treewhile ($z->name === 'product'){ // either one should work //$node = new SimpleXMLElement($z->readOuterXML()); $node = simplexml_import_dom($doc->importNode($z->expand(), true));

// now you can use $node without going insane about parsing var_dump($node->element_1);

// go to next <product /> $z->next('product');}

Running processes

Pipes

Linux

wget http://example.com/lol.xml.gz

gunzip lol.xml.gz

Linux

wget -O- http://example.com/lol.xml.gz | gunzip

$command = "wget -O- $url | gunzip";

$process = proc_open($command, array( array("pipe","r"), array("pipe","w"), array("pipe","w") ),$pipes);

while(!feof($pipes[1])) { $buffer .= fgets($pipes[1], 128); if (strpos($buffer, '<Item>')) {

// detected start of the item } if (strpos($buffer, '</Item>')) {

// detected end of the item }}fclose($pipes[1]);proc_close($process);

Reading from MySQL

mysql_unbuffered_query

$lh = mysql_connect( 'server', 'uname', 'pword' );

$qry = "SELECT * FROM my_bigass_table";

$rh = mysql_unbuffered_query( $qry, $lh );

while ( $res = mysql_fetch_row( $rh ) )

{

process($res);

}

Outputting data

PHP

$result = '';

foreach ($data as $item) {

$line = 'Name ' . $item['name'] . PHP_EOL;

$result .= $line;

}

echo $result;

PHP

$result = '';

ob_end_clean();

foreach ($data as $item) {

echo 'Name ' . $item['name'] . PHP_EOL;

flush();

}

PHP 5.5

Generators

Yield

Line-by-line processing

$file_handle = fopen("myfile", "r");

while (!feof($file_handle)) {

$line = fgets($file_handle);

process($line);

}

fclose($file_handle);

Line-by-line processing

function read() { $file_handle = fopen("myfile", "r"); while (!feof($file_handle)) { $line = fgets($file_handle); yield $line; } fclose($file_handle);}

$data = read();foreach ($data as $line) {}

Making HTTP requests

Open connections limit

Connection Sharing with CURL in PHP: How to re-use HTTP connections to knock 70% off REST network time.http://technosophos.com/content/connection-sharing-curl-php-how-re-use-http-connections-knock-70-

Next steps

Gearman

Hadoop

Why PHP?

What’s possible

Using it for good

Thanks