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<h2 class="title">Basic usage</h2>
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<div class="example" id="example-3722">
<p><strong>Example #1 Shared Memory Operations Overview</strong></p>
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<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /> <br /></span><span style="color: #FF8000">// Create 100 byte shared memory block with system id of 0xff3<br /></span><span style="color: #0000BB">$shm_id </span><span style="color: #007700">= </span><span style="color: #0000BB">shmop_open</span><span style="color: #007700">(</span><span style="color: #0000BB">0xff3</span><span style="color: #007700">, </span><span style="color: #DD0000">"c"</span><span style="color: #007700">, </span><span style="color: #0000BB">0644</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$shm_id</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"Couldn't create shared memory segment\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #FF8000">// Get shared memory block's size<br /></span><span style="color: #0000BB">$shm_size </span><span style="color: #007700">= </span><span style="color: #0000BB">shmop_size</span><span style="color: #007700">(</span><span style="color: #0000BB">$shm_id</span><span style="color: #007700">);<br />echo </span><span style="color: #DD0000">"SHM Block Size: " </span><span style="color: #007700">. </span><span style="color: #0000BB">$shm_size </span><span style="color: #007700">. </span><span style="color: #DD0000">" has been created.\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// Lets write a test string into shared memory<br /></span><span style="color: #0000BB">$shm_bytes_written </span><span style="color: #007700">= </span><span style="color: #0000BB">shmop_write</span><span style="color: #007700">(</span><span style="color: #0000BB">$shm_id</span><span style="color: #007700">, </span><span style="color: #DD0000">"my shared memory block"</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br />if (</span><span style="color: #0000BB">$shm_bytes_written </span><span style="color: #007700">!= </span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #DD0000">"my shared memory block"</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"Couldn't write the entire length of data\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #FF8000">// Now lets read the string back<br /></span><span style="color: #0000BB">$my_string </span><span style="color: #007700">= </span><span style="color: #0000BB">shmop_read</span><span style="color: #007700">(</span><span style="color: #0000BB">$shm_id</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">$shm_size</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$my_string</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"Couldn't read from shared memory block\n"</span><span style="color: #007700">;<br />}<br />echo </span><span style="color: #DD0000">"The data inside shared memory was: " </span><span style="color: #007700">. </span><span style="color: #0000BB">$my_string </span><span style="color: #007700">. </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">//Now lets delete the block and close the shared memory segment<br /></span><span style="color: #007700">if (!</span><span style="color: #0000BB">shmop_delete</span><span style="color: #007700">(</span><span style="color: #0000BB">$shm_id</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"Couldn't mark shared memory block for deletion."</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">shmop_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$shm_id</span><span style="color: #007700">);<br /> <br /></span><span style="color: #0000BB">?></span>
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