Replace whitespaces ONLY between " "

Hello!

How can I replace all whitespaces between " " in a string. An Example:

$string = 'w1 w2 "w3 w4" w5 w6 w7 "w8 w9"';

the output must look like this:

$string = 'w1 w2 "w3_w4" w5 w6 w7 "w8_w9"';

Thank you very much for your help!

Best regards, Steve.

Enjoy...might be some better way than that given here.....

<?
$input = 'w1 w2 "w3 w4" w5 w6 w7 "w8 w9" w10 "w11 w12"';
echo "Input String -> ".$input;
echo "<br>";

// find the total occurrences of "

for ($i=0;$i<strlen($input);$i++){
if (substr($input,$i,1) == '"'){
$cnt++;
}
}

// explode the string with separator "

$arr=explode('"',$input);

$j=1;

// replace the space with underscore at corresponding cells in array

while ($j <= $cnt){
$arr[$j]='"'.str_replace(' ','_',$arr[$j]).'"';
$j += 2;
}

// form the output string

for ($k=0;$k<sizeof($arr);$k++){
$output .= $arr[$k];
}

echo "Output String -> ".$output."\n";
?>

Try this code it is much easier to manage.

<body>
<?php

$string = '"w3 w4"';
$pattern = "^{\"([[:alnum:]]+)([[:space:]]+)([[:alnum:]]+)\"$";}
$replacement = "\"\1_\3\"";

echo(eregi_replace($pattern,$replacement,$string));

?>
</body>

Happy coding!

Hi Ashish! It runs... Thank you for your very good example!