title: Removing Null items in php array
body: <p>How can I remove <code>null</code> in the following php array?
  Can anyone help me pease?</p>
  
  <pre><code>{
      "total": 20,
      "memberships": [
          "channel-568e2ec856e52816891757",
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
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          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          "channel-568e2ec856e52816891757",
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          "channel-568e2ec856e52816891757",
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          "channel-548a652109b5f855658713",
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          "channel-5695f8e9a0c56329461106",
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          "channel-540e028357c11975473911",
          "channel-5631e7c4a317d864607733",
          null,
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          "channel-568e2ec856e52816891757",
          null,
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          null,
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          null,
          "channel-5631e7c4a317d864607733",
          null,
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          "channel-548a652109b5f855658713",
          null,
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          null,
          null,
          null,
          null,
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          null,
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          null,
          null,
          null,
          "channel-548a652109b5f855658713",
          null,
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          null,
          null,
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          null,
          "channel-548a652109b5f855658713",
          null,
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          null,
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          null,
          null,
          null,
          null,
          null,
          null,
          "channel-568d788e05dcd282842479",
          "channel-568e2ec856e52816891757",
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          "channel-568e2ec856e52816891757",
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
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          null,
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          null,
          null,
          null,
          null,
          "channel-568e2ec856e52816891757",
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          "channel-5695f8e9a0c56329461106",
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
          null,
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          null,
          null,
          null,
          null,
          null,
          null,
          "channel-568e2ec856e52816891757",
          "channel-5695f8e9a0c56329461106",
          null,
          null,
          null,
          null,
          null,
          null,
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          [
              ""
          ]
      ]
  }
  </code></pre>