title: PHP 5.2 array_push inserts a null value
body: <p>Hi I'm encountering  a weird problem iterating and pushing a value in an array(for better viewing i use json data). Below is the data i'm using in my foreach for the data below. I actually don't know what the problem is but i'm using php 5.2 </p>
  
  <pre><code>[
  {
  account_grp: "SOLD",
  sold_to: "1000005071",
  sold_to_name: "MARIA LUZ MANALILI",
  ship_to: "1000005071",
  ship_to_name: "MARIA LUZ MANALILI",
  division: "20",
  division_desc: "Pharma Sales",
  salesman: "E000112086",
  salesman_name: null,
  doc_type: "DA",
  posting_date: "20170707",
  clearing: "2100030778",
  doc_no: "1400009660",
  assignment: "5110074314",
  ref_no: "RC - RECLASS",
  amt_w_vat: "6496.62",
  vat: "779.5944",
  amt_net_vat: "5717.0256",
  cust_group2_desc: "MEAD JOHNSON",
  cust_group_desc: "Reg Accnt-Non-Chain",
  gl_account: "0000123001",
  gl_account_desc: "TRADE RECEIVABLE",
  check_date: null,
  check_details: "RC - DAIF",
  remarks: "RC - DAIF",
  posting_key: "09",
  line_item: "001",
  fiscal_year: "2017",
  tax_class: "1",
  doc_no2: "1400009660"
  },
  {
  account_grp: "SOLD",
  sold_to: "1000004711",
  sold_to_name: "PAZ PHARMACY",
  ship_to: "1000004711",
  ship_to_name: "PAZ PHARMACY",
  division: "20",
  division_desc: "Pharma Sales",
  salesman: "E000071970",
  salesman_name: "IGLORIA, JOAN DELICANO",
  doc_type: "DA",
  posting_date: "20170707",
  clearing: "1700004713",
  doc_no: "1400009658",
  assignment: "5120008912",
  ref_no: "RC - RECLASS",
  amt_w_vat: "72783.62",
  vat: "8734.0344",
  amt_net_vat: "64049.5856",
  cust_group2_desc: "INDEPENDENT",
  cust_group_desc: "Reg Accnt-Non-Chain",
  gl_account: "0000123001",
  gl_account_desc: "TRADE RECEIVABLE",
  check_date: null,
  check_details: "RC - Tech Reason",
  remarks: "RC - Tech Reason",
  posting_key: "09",
  line_item: "001",
  fiscal_year: "2017",
  tax_class: "1",
  doc_no2: "1400009658"
  },
  {
  account_grp: "SOLD",
  sold_to: "1000003609",
  sold_to_name: "DR. ANDEYLEF JOY S. CABUTIHAN",
  ship_to: "2000003312",
  ship_to_name: "DR. ANDELEYLEF JOY S. CABUTIHAN",
  division: "20",
  division_desc: "Pharma Sales",
  salesman: "E000112086",
  salesman_name: null,
  doc_type: "DA",
  posting_date: "20170714",
  clearing: "2100031395",
  doc_no: "1400009796",
  assignment: "5110077391",
  ref_no: "RC - RECLASS",
  amt_w_vat: "11577.10",
  vat: "1389.2520",
  amt_net_vat: "10187.8480",
  cust_group2_desc: "MEAD JOHNSON",
  cust_group_desc: "Reg Accnt-Non-Chain",
  gl_account: "0000123001",
  gl_account_desc: "TRADE RECEIVABLE",
  check_date: null,
  check_details: "RC - DAIF",
  remarks: "RC - DAIF",
  posting_key: "09",
  line_item: "001",
  fiscal_year: "2017",
  tax_class: "1",
  doc_no2: "1400009796"
  },
  {
  account_grp: "SOLD",
  sold_to: "1000005447",
  sold_to_name: null,
  ship_to: "2000004135",
  ship_to_name: null,
  division: "20",
  division_desc: "Pharma Sales",
  salesman: "E000112086",
  salesman_name: null,
  doc_type: "DA",
  posting_date: "20170720",
  clearing: "2100031892",
  doc_no: "1400010004",
  assignment: "5130007369",
  ref_no: "RC - RECLASS",
  amt_w_vat: "11581.83",
  vat: "1389.8196",
  amt_net_vat: "10192.0104",
  cust_group2_desc: "MEAD JOHNSON",
  cust_group_desc: "Reg Accnt-Non-Chain",
  gl_account: "0000123001",
  gl_account_desc: "TRADE RECEIVABLE",
  check_date: null,
  check_details: "RC - DAIF",
  remarks: "RC - DAIF",
  posting_key: "09",
  line_item: "001",
  fiscal_year: "2017",
  tax_class: "1",
  doc_no2: "1400010004"
  }
  ] 
  </code></pre>
  
  <p>here's my code</p>
  
  <pre><code>public function create($aData)
  {
  
      $aValues = array();
  
  
      foreach ($aData as $key =&gt; $aReport) 
      {
  
  
          $sData = implode(',', $aReport);
  
  
          array_push($aValues, "(". $sData. ")");
  
      }
      echo json_encode($aValues);die();
  
  
  }
  </code></pre>
  
  <p>and when i echo the $aValues here's the output</p>
  
  <pre><code>[
  null,
  "(SOLD,1000004711,PAZ PHARMACY,1000004711,PAZ PHARMACY,20,Pharma Sales,E000071970,IGLORIA, JOAN DELICANO,DA,20170707,1700004713,1400009658,5120008912,RC - RECLASS,72783.62,8734.0344,64049.5856,INDEPENDENT,Reg Accnt-Non-Chain,0000123001,TRADE RECEIVABLE,,RC - Tech Reason,RC - Tech Reason,09,001,2017,1,1400009658)",
  null,
  null
  ]
  </code></pre>