Cara menggunakan php replace

Gan bagaimana caranya, menreplace suatu karakter dengan karakter lain melalui PHP. Contoh: Saya punya variabel yang value nya dinamis dari database. $karakter = 'andra+and+andri'; Gimana caranya merubah '+' dengan spasi, jadi nanti saat di echo hasilnya: andra and andri

<?php
echo str_replace("world","Cahya","Hello world!");
?>

<?php
 $search = array(
  'bodoh',
  'boros',
  'malas'
 );

 $replace = array(
  'pintar',
  'hemat',
  'rajin'
 );

 $subject = "saya adalah anak bodoh, yang boros dan malas";

 echo str_replace($search, $replace, $subject);
?>

In many countries the numeric format is 1.000,33 in english it is 1,000.33

This function converts numeric arguments always into the PHP confirm numeric format. If only one seperator is into the numericstring so it is interpreted as the decimalpoint.

function dp($zahl)
{
  if ((strpos($zahl,".") > "-1") | (strpos($zahl,",") > "-1")) {
    if ((strpos($zahl,".") > "-1") & (strpos($zahl,",") > "-1")) {
      if (strpos($zahl,".") > strpos($zahl,",")){
          return str_replace(",","",$zahl);
    } else {
          return str_replace(",",".",str_replace(".","",$zahl));
      }
  } else {
      if (strpos($zahl,".") > "-1") {
        if (strpos($zahl,".") == strrpos($zahl,".")) {
            return $zahl;
      } else {
          return str_replace(".","",$zahl);
        }
    } else {
        if (strpos($zahl,",") == strrpos($zahl,",")) {
          return str_replace(",",".",$zahl);
      } else {
          return str_replace(",","",$zahl);
        }
    } }
} else {
    return $zahl;
} }