php inserts new characters at the specified position in the string, php string specifies the characters_PHP tutorial

php inserts new characters at the specified position in the string, and php string specifies the characters

Since the project uses the DataTable table to load background data, it is necessary to query the selected policy status of the virtual machine through the table , so I thought of taking out the contents of the policy table first and forming a '<select><option value="1"></option>[n options]</select>' string, and then traversing the virtual When machine list, spell his strategy value into a string like 'value="1"', and then use explode() and implode() function composes a new string and returns it to the front desk, thus realizing the selected state.

<span><span> 1    </span><span>$option</span> = '&lt;select class="sla_list"&gt;'<span>;
</span><span> 2    </span> 
<span> 3    </span><span>//</span><span> 取出所有策略</span>
<span> 4    </span><span>$sla_query</span> = <span>$this</span>-&gt;db-&gt;select('sla_id, name')-&gt;get('sla'<span>);
</span><span> 5</span>         <span>$sla_res</span> = <span>$sla_query</span>-&gt;<span>result_array();
</span><span> 6</span>         <span>if</span> (!<span>empty</span>(<span>$sla_res</span><span>)) {
</span><span> 7</span>             <span>$option</span> .= '&lt;option value="0"&gt;未保护&lt;/option&gt;'<span>;
</span><span> 8</span>             <span>foreach</span> (<span>$sla_res</span> <span>as</span> <span>$k1</span> =&gt; <span>$v1</span><span>) {
</span><span> 9</span>                 <span>$option</span> .= '&lt;option value="' . <span>$v1</span>['sla_id'] . '"&gt;' . <span>$v1</span>['name'] . '&lt;/option&gt;'<span>;
</span><span>10</span> <span>            }
</span><span>11</span>             <span>$option</span> .= '&lt;/select&gt;'<span>;
</span><span>12</span> 
<span>13</span>         } <span>else</span><span> {
</span><span>14</span>             <span>$option</span> .= '&lt;option value="0"&gt;未保护&lt;/option&gt;&lt;/select&gt;'<span>;
</span><span>15</span> <span>        }
</span><span>16</span> 
<span>17</span> 
<span>18    </span><span>//</span><span> 选中默认的保护策略</span>
<span>19    </span><span>$vm_query</span> = <span>$this</span>-&gt;db-&gt;select('sla_id')-&gt;where('vm_id', <span>$</span>vm_id)-&gt;get('task_vm', 1<span>);
</span><span>20</span>    <span>$vm_res</span> = <span>$vm_query</span>-&gt;<span>row_array();
</span><span>21    </span><span>if</span> (<span>is_null</span>(<span>$vm_res</span>['sla_id'])) <span>$res</span>['sla_id'] = 0<span>;
</span><span>22    </span><span>$selected</span> = 'value="' . <span>$vm_res</span>['sla_id'] . '"'<span>;
</span><span>23    </span><span>$new_str_arr</span> = <span>explode</span>(<span>$selected</span>, <span>$option</span><span>);
</span><span>24</span>    <span>$new_option</span> = <span>implode</span>(" {<span>$selected</span>} selected", <span>$new_str_arr</span>);</span>

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