如何在Codeigniter中的字符串的最后一个索引中添加/替换字符？
I have a data like this:
"[-8.390865416667355, 115.23490905761719],[-8.483238563913513, 115.19783020019531],[-8.504970203442133, 115.40382385253906]"
I want to add character "[" in the first index of my string value and "]" in my last index. But i dont know how to insert the character in the last index of my string value so my string would be appear like this:
"[[-8.390865416667355, 115.23490905761719],[-8.483238563913513, 115.19783020019531],[-8.504970203442133, 115.40382385253906]]"
我有这样的数据： p>
“ [-8.390865416667355,115.23490905761719]，[ - 8.483238563913513， 115.19783020019531]，[ - 8.504970203442133,115.40382385253906]“ p> blockquote>
我想添加字符”[“ 我的字符串值的第一个索引和我上一个索引中的“]”。 但我不知道如何在我的字符串值的最后一个索引中插入字符，所以我的字符串将显示如下： p>
“[[ - 8.390865416667355,115.23490905761719] ，[ - 8.483238563913513， 115.19783020019531]，[ - 8.504970203442133,115.40382385253906]]“ p> blockquote> div>
You could just concatenate, like so:
$str = "[-8.390865416667355, 115.23490905761719],[-8.483238563913513, 115.19783020019531],[-8.504970203442133, 115.40382385253906]";
$new_str = "[".$str."]";
echo $new_str;