如果在PHP中的for循环中重复检查字符串

Question

    $a="abc";
    $b=123;
    $c=1;

    for ($i=0;$i<3;$i++) {
        $str="'" . $a . "' , '" . $b . "', '" . $c . "', '1'";
        $sum .= "(" . $str . "),";
    }
    //output ('abc' , '123', '1', '1'),('abc' , '123', '1', '1'),('abc' , '123', '1', '1'),
    echo $sum;

Can anyone help me with the above codes? I want the $sum to output ('abc' , '123', '1', '1'), one time only. That I have to check the $str is repeated.

Can anyone help me or give me some hits? Thanks.

Answer 1

This will check if the string is the same. if it is, we move on

<?php
    $a="abc";
    $b=123;
    $c=1;

    $tempStr =  '';
    $str = '';
    $sum = '';
    for ($i=0;$i<3;$i++) {
        $tempStr = "'" . $a . "' , '" . $b . "', '" . $c . "', '1'";
        if ($tempStr === $str) {
            continue;
        }//END IF
        $str="'" . $a . "' , '" . $b . "', '" . $c . "', '1'";
        $sum .= "(" . $str . "),";
    }
    //output ('abc' , '123', '1', '1')
    echo rtrim($sum, ',');
?>

EDIT: added a fiddle here