How to print current index or for loop in PHP?-CodePudding

The below PHP code returns 12345678910...... at a stretch.

for ($i=0; $i<1000; $i  ) {
      sleep(1);
      echo $i;
}

How can I get it to print only the current loop number instead of printing all numbers together?

CodePudding user response：

This can be easily done in php cli using the backspace character "\x08"

<?php
$length = 0;
for ($i=0; $i<1000; $i  )
{
    // delete as much character as the length of the previous number
    echo str_repeat("\x08", $length);

    sleep(1);
    echo $i;

    // get the length of the number, so you know how much you have to delete
    $length = strlen((string)$i);
}

CodePudding user response：

This is my suggested answer (applicable to browser)

a) I believe the OP wants to have the output generated to the browser interface

b) To generate the output of the count during the 1-second sleep, we need to flush the output before each sleep

c) In a browser interface, it is not possible to generate a backspace, so let's do a javascript trick to update the div

<div id=output1></div>
<?php

$index=0;

while($index < 1000) { 

    ob_start();
    echo "<script>document.getElementById('output1').innerHTML=" . $index . "</script>";

    ob_end_flush();
    @ob_flush();
    flush();    
    sleep(1);
    $index  ;
}
?>