title: Need help on PHP array filtering
body: <p>I have this array in php, i want to select all casenumber those have dob and then select all links those not have any dob. How can I do that in php</p>
  
  <pre><code>Array
  (
      [links] =&gt; Array
          (
              [0] =&gt; inquiryDetail.jis?caseId=0101SP085622015&amp;loc=3&amp;detailLoc=DV
              [1] =&gt; inquiryDetail.jis?caseId=0101SP096462015&amp;loc=3&amp;detailLoc=DV
              [2] =&gt; inquiryDetail.jis?caseId=050200173642014&amp;loc=20&amp;detailLoc=DSCIVIL
              [3] =&gt; inquiryDetail.jis?caseId=CAL1432003&amp;loc=65&amp;detailLoc=PGV
          )
      [case_number] =&gt; Array
          (
              [0] =&gt; 0101SP085622015
              [1] =&gt; 0101SP096462015
              [2] =&gt; 050200173642014
              [3] =&gt; CAL1432003
          )
      [persons] =&gt; Array
          (
              [0] =&gt; Walker, Rosemary
              [1] =&gt; Walker, Rosemary
              [2] =&gt; Walker, Rosemary
              [3] =&gt; Walker, Rosemary
          )
      [dob] =&gt; Array
          (
              [0] =&gt; 11/1961
              [1] =&gt; 11/1961
          )
      [Party_Type] =&gt; Array
          (
              [0] =&gt; Defendant
              [1] =&gt; Defendant
              [2] =&gt; Defendant
              [3] =&gt; Defendant
          )
  
      [Court] =&gt; Array
          (
              [0] =&gt; Baltimore City District Court 1400 North Ave.
              [1] =&gt; Baltimore City District Court 1400 North Ave.
              [2] =&gt; Upper Marlboro District Court
              [3] =&gt; Prince George\'s County Circuit Court
          )
      [Case_Type] =&gt; Array
          (
              [0] =&gt; Domestic Violence
              [1] =&gt; Domestic Violence
              [2] =&gt; CONT
              [3] =&gt; CIVIL
          )
  
      [Case_Status] =&gt; Array
          (
              [0] =&gt; CLOSE
              [1] =&gt; CLOSE
              [2] =&gt; ACTIVE
              [3] =&gt; ACTIVE
          )
      [Filing_Date] =&gt; Array
          (
              [0] =&gt; 09/04/2015
              [1] =&gt; 11/25/2015
              [2] =&gt; 07/24/2014
              [3] =&gt; 11/18/2014
          )
  
  )
  </code></pre>
  
  <p>Here all are inter connected with keys to each other. please help</p>