## Basic usage

示例 #1 Basic Gearman client and worker

This example shows a very simple client and worker. The client sends a string to the job server, and the worker reverses the string and sends it back. The job is performed synchronously.

`<?php
# Create our client object.
$gmclient= new GearmanClient();
# Add default server (localhost).
$gmclient->addServer();
echo "Sending job\n";
# Send reverse job
do
{
$result = $gmclient->doNormal("reverse", "Hello!");
# Check for various return packets and errors.
switch($gmclient->returnCode())
{
case GEARMAN_WORK_DATA:
echo "Data: $result\n";
break;
case GEARMAN_WORK_STATUS:
list($numerator, $denominator)= $gmclient->doStatus();
echo "Status: $numerator/$denominator complete\n";
break;
case GEARMAN_WORK_FAIL:
echo "Failed\n";
exit;
case GEARMAN_SUCCESS:
echo "Success: $result\n";
break;
default:
echo "RET: " . $gmclient->returnCode() . "\n";
exit;
}
}
while($gmclient->returnCode() != GEARMAN_SUCCESS);
?>`
`<?php
echo "Starting\n";
# Create our worker object.
$gmworker= new GearmanWorker();
# Add default server (localhost).
$gmworker->addServer();
# Register function "reverse" with the server. Change the worker function to
# "reverse_fn_fast" for a faster worker with no output.
$gmworker->addFunction("reverse", "reverse_fn");
print "Waiting for job...\n";
while($gmworker->work())
{
if ($gmworker->returnCode() != GEARMAN_SUCCESS)
{
echo "return_code: " . $gmworker->returnCode() . "\n";
break;
}
}
function reverse_fn($job)
{
echo "Received job: " . $job->handle() . "\n";
$workload = $job->workload();
$workload_size = $job->workloadSize();
echo "Workload: $workload ($workload_size)\n";
# This status loop is not needed, just showing how it works
for ($x= 0; $x < $workload_size; $x++)
{
echo "Sending status: " . ($x + 1) . "/$workload_size complete\n";
$job->sendStatus($x, $workload_size);
sleep(1);
}
$result= strrev($workload);
echo "Result: $result\n";
# Return what we want to send back to the client.
return $result;
}
# A much simpler and less verbose version of the above function would be:
function reverse_fn_fast($job)
{
return strrev($job->workload());
}
?>`

以上示例的输出类似于：

    % php reverse_worker.php
    Starting
    Waiting for job...
    Received job: H:foo.local:36
    Workload: Hello! (6)
    Sending status: 1/6 complete
    Sending status: 2/6 complete
    Sending status: 3/6 complete
    Sending status: 4/6 complete
    Sending status: 5/6 complete
    Sending status: 6/6 complete
    Result: !olleH

    % php reverse_client.php
    Starting
    Sending job
    Status: 1/6 complete
    Status: 2/6 complete
    Status: 3/6 complete
    Status: 4/6 complete
    Status: 5/6 complete
    Status: 6/6 complete
    Success: !olleH

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