When php reads a txt file, the first line always fails to recognize numbers correctly. What should I do?

I read the contents of a txt file line by line,
but the first line of each file is always not recognized correctly.
What should I do?

<code>    $rTxt = fopen( $sTxt  ,"r" );
    
    while( $str = fgets($rTxt) )
    {
    
        $arr = explode( ',' , $str );
        Var_Dump( $arr[0] );
    }
    
    fclose( $rTxt );</code>

txt file content:

<code>1393592460,10680,10660,10650,10720,6040,3.227103E+08,0,0,108,4746,0,0
1393592520,10656,10697,10656,10701,4888,2.612444E+08,0,0,203,6858,0,0
1393592580,10697,10672,10672,10700,1294,6.911194E+07,0,0,281,7086,0,0
1393592640,10671,10667,10661,10675,1706,9.101747E+07,0,0,354,7590,0,0
1393592700,10669,10650,10648,10670,2340,1.246486E+08,0,0,448,8664,0,0
1393592760,10652,10640,10632,10656,1938,1.031578E+08,0,0,545,9282,0,0
1393592820,10641,10657,10641,10662,1746,9.297165E+07,0,0,631,8922,0,0
......</code>

Every time I read it, the length of the first number in the first line of the file is always wrong. There should be an invisible string...:

<code>string(13) "1393592460"
string(10) "1393592520"
string(10) "1393592580"
string(10) "1393592640"

</code>

Reply content:

I read the contents of a txt file line by line,
but the first line of each file is always not recognized correctly.
What should I do?

<code>    $rTxt = fopen( $sTxt  ,"r" );
    
    while( $str = fgets($rTxt) )
    {
    
        $arr = explode( ',' , $str );
        Var_Dump( $arr[0] );
    }
    
    fclose( $rTxt );</code>

txt file content:

<code>1393592460,10680,10660,10650,10720,6040,3.227103E+08,0,0,108,4746,0,0
1393592520,10656,10697,10656,10701,4888,2.612444E+08,0,0,203,6858,0,0
1393592580,10697,10672,10672,10700,1294,6.911194E+07,0,0,281,7086,0,0
1393592640,10671,10667,10661,10675,1706,9.101747E+07,0,0,354,7590,0,0
1393592700,10669,10650,10648,10670,2340,1.246486E+08,0,0,448,8664,0,0
1393592760,10652,10640,10632,10656,1938,1.031578E+08,0,0,545,9282,0,0
1393592820,10641,10657,10641,10662,1746,9.297165E+07,0,0,631,8922,0,0
......</code>

Every time I read it, the length of the first number in the first line of the file is always wrong. There should be an invisible string...:

<code>string(13) "1393592460"
string(10) "1393592520"
string(10) "1393592580"
string(10) "1393592640"

</code>

Most likely it is a utf8 bom character.
Quote SO How to remove multiple UTF-8 BOM sequences

<code>//Remove UTF8 Bom

function remove_utf8_bom($text)
{
    $bom = pack('H*','EFBBBF');
    $text = preg_replace("/^$bom/", '', $text);
    return $text;
}</code>

Use this function to process your first line and it should be fine.

Want to know more about BOM:
Zhihu - What is the difference between "UTF-8 with BOM" and "UTF-8 without BOM"
Wikipedia