(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0)
NumberFormatter::setPattern -- numfmt_set_pattern — Set formatter pattern
Object oriented style
public NumberFormatter::setPattern ( string $pattern ) : bool
Procedural style
numfmt_set_pattern ( NumberFormatter $fmt , string $pattern ) : bool
Set the pattern used by the formatter. Can not be used on a rule-based formatter.
fmt
NumberFormatter object.
pattern
Pattern in syntax described in » ICU DecimalFormat documentation.
 Returns true on success or false on failure. 
Example #1 numfmt_set_pattern() example
<?php $fmt = numfmt_create( 'de_DE', NumberFormatter::DECIMAL ); echo "Pattern: ".numfmt_get_pattern($fmt)."\n"; echo numfmt_format($fmt, 1234567.891234567890000)."\n"; numfmt_set_pattern($fmt, "#0.# kg"); echo "Pattern: ".numfmt_get_pattern($fmt)."\n"; echo numfmt_format($fmt, 1234567.891234567890000)."\n"; ?>
Example #2 OO example
<?php
$fmt = new NumberFormatter( 'de_DE', NumberFormatter::DECIMAL );
echo "Pattern: ".$fmt->getPattern()."\n";
echo $fmt->format(1234567.891234567890000)."\n";
$fmt->setPattern("#0.# kg");
echo "Pattern: ".$fmt->getPattern()."\n";
echo $fmt->format(1234567.891234567890000)."\n";
?> The above example will output:
Pattern: #,##0.### 1.234.567,891 Pattern: #0.# kg 1234567,9 kg
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    https://www.php.net/manual/en/numberformatter.setpattern.php