How to determine a character in another string, determine the character, string_PHP tutorial

How to judge a character in another string, string

Application scenario: When making modification operations, check the selected state of the check box.

<span>//</span><span>字段存的是id值，如 7,8,9  这些id值是需要被选中的</span>

<span>$checkId</span> = '7,8,9'<span>;

被循环的id值

</span><span>$idAll</span> = <span>array</span>('1','2','3','5','7','8','9'<span>);

 // ',7,8,9,'   ',1,'

</span><span>foreach</span>(<span>$idAll</span> <span>as</span> <span>$k</span>=><span>$v</span><span>){

　　</span><span>if</span>(<span>strpos</span>(','.<span>$checked</span>.',', ' ,  '.<span>$v</span>.','<span>) !== FALSE){

　　　　</span><span>$check</span> = 'checked="checked"'<span>;

　　}</span><span>else</span><span>{

　　　　</span><span>$check</span> = ''<span>;

　　}

}</span>

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