(PECL sync >= 1.0.0)
SyncReaderWriter::readlock — Waits for a read lock
public SyncReaderWriter::readlock ([ int $wait = -1 ] ) : bool
Obtains a read lock on a SyncReaderWriter object.
wait
The number of milliseconds to wait for a lock. A value of -1 is infinite.
A boolean of TRUE if the lock was obtained, FALSE otherwise.
Example #1 SyncReaderWriter::readlock() example
<?php
$readwrite = new SyncReaderWriter("FileCacheLock");
$readwrite->readlock();
/* ... */
$readwrite->readunlock();
?>
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https://www.php.net/manual/en/syncreaderwriter.readlock.php