note 98198 modified in function.sprintf by visualmind

<?php
function preg_sprintf($format,$params){
    $result = ''; $anchor=0; $pattern = '/{([0-9a-zA-Z_]+)}/';
    
    $n = preg_match_all($pattern, $format,$matches, PREG_OFFSET_CAPTURE);
    
    for($i=0; $i<$n; $i++){
        $result .= substr($format, $anchor, $matches[0][$i][1]-$anchor);
        if(isset($params[$matches[1][$i][0]])) $result .= $params[$matches[1][$i][0]];
        $anchor = $matches[0][$i][1] + strlen($matches[0][$i][0]);
    }
    
    $result .= substr($format, $anchor, strlen($format)-$anchor);
    
    return $result;
}

echo preg_sprintf('f {key} = {value}, {fas}b {key} {efs}',array('fas'=>'FAS', 'key'=>'KEY', 'value'=>'VALUE'));

//will echo: f KEY = VALUE, FASb KEY
?>

--was--
function preg_sprintf($format,$params){
    $result = ''; $anchor=0; $pattern = '/{([0-9a-zA-Z_]+)}/';
    
    $n = preg_match_all($pattern, $format,$matches, PREG_OFFSET_CAPTURE);
    
    for($i=0; $i<$n; $i++){
        $result .= substr($format, $anchor, $matches[0][$i][1]-$anchor);
        if(isset($params[$matches[1][$i][0]])) $result .= $params[$matches[1][$i][0]];
        $anchor = $matches[0][$i][1] + strlen($matches[0][$i][0]);
    }
    
    $result .= substr($format, $anchor, strlen($format)-$anchor);
    
    return $result;
}

echo preg_sprintf('f {key} = {value}, {fas}b {key} {efs}',array('fas'=>'FAS', 'key'=>'KEY', 'value'=>'VALUE'));

//will echo: f KEY = VALUE, FASb KEY

http://php.net/manual/en/function.sprintf.php