①, Concatenate arrays into strings
<?php /** * Created by PhpStorm. * User: autofelix * Date: 12/17/20 * Time:
10:48 PM * Desc: string manipulation */ $arr = ['autofelix', 'love', 'csdn']; $str =
implode(',', $arr); echo $str;
* result autofelix,love,csdn
②, Split a string into an array as a string
<?php /** * Created by PhpStorm. * User: autofelix * Date: 12/17/20 * Time:
10:48 PM * Desc: string manipulation */ $str = 'autofelix|handsome|forever|young'; $arr =
explode('|', $str); echo json_encode($arr);
* result [ "autofelix", "handsome", "forever", "young" ]
③, Splits a string into an array or a specified length of characters as a single string
<?php /** * Created by PhpStorm. * User: autofelix * Date: 12

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