issues creating an array php
===

I'm writing a PHP application, and one of the features is be able to query gene interactions in all our tables `(gene_r, genes_newL_dn, genes_newL_up, genes_oldL_up, genes_oldL_dn)`.
So I have the following `PHP` function to query all those databases at once.


    public function getAllInteractions($input){
		$data = array();

		$sql_list = (
			"SELECT * FROM genes_r JOIN drugs_r ON drugs_r.id = genes_r.id WHERE drug_name='$input' OR gene_name='$input'",
			"SELECT * FROM genes_newL_dn JOIN drugs_newL_dn ON drugs_newL_dn.id = genes_newL_dn WHERE drug_name='$input' OR gene_name='$input'",
			"SELECT * FROM genes_newL_up JOIN drugs_newL_up ON drugs_newL_up.id = genes_newL_up WHERE drug_name='$input' OR gene_name='$input'",
			"SELECT * FROM genes_oldL_dn JOIN drugs_oldL_dn ON drugs_oldL_dn.id = genes_oldL_dn WHERE drug_name='$input' OR gene_name='$input'",
			"SELECT * FROM genes_oldL_up JOIN drugs_oldL_up ON drugs_oldL_up.id = genes_oldL_up WHERE drug_name='$input' OR gene_name='$input'"
		);
		
		foreach($sql_list as $sql){
			$query = $this->db->query($sql);
			// case 1 : SQL Query invalid / empty results
			if(!$query || $query->num_rows() == 0) {
				continue;	
			}
			else {
				$id = $query->row()->id;
				$sql = "SELECT interaction from matrix_r WHERE id='$id'";
				$query = $this->db->query($sql);
				array_push($data, $query->row());
			}	
		}
		
		return $data;
	}

However, I'm getting the following error:

    PHP Parse error:  syntax error, unexpected ',' in 
    /chemicalgenomics/ci/application/models/search_model.php on line 81

I'm not getting why does not like the ','. It's supposed to be an array of strings. Could someone please help me with that?
Thanks

PS: `Line 81` is the first line in the array: `"SELECT * FROM ...`