PHP substr_replace()函数的几个应用例子

    
<?php
	$var = 'ABCDEFGH:/MNRPQR/';
	echo "Original: $var<hr />\n";
	/* These two examples replace all of $var with 'bob'. */
	echo substr_replace($var, 'bob', 0) . "<br />\n";
	echo substr_replace($var, 'bob', 0, strlen($var)) . "<br />\n";
	/* Insert 'bob' right at the beginning of $var. */
	echo substr_replace($var, 'bob', 0, 0) . "<br />\n";
	/* These next two replace 'MNRPQR' in $var with 'bob'. */
	echo substr_replace($var, 'bob', 10, -1) . "<br />\n";
	echo substr_replace($var, 'bob', -7, -1) . "<br />\n";
	/* Delete 'MNRPQR' from $var. */
	echo substr_replace($var, '', 10, -1) . "<br />\n";
?>

Original: ABCDEFGH:/MNRPQR/
bob
bob
bobABCDEFGH:/MNRPQR/
ABCDEFGH:/bob/
ABCDEFGH:/bob/
ABCDEFGH://

    
<?php
	$longString = 'abcdefghijklmnopqrstuvwxyz0123456789z.jpg';
	$separator = '...';
	$separatorlength = strlen($separator) ;
    // 需要保留的字符串
	$maxlength = 25 - $separatorlength;
    // 从一半的长度开始
	$start = $maxlength / 2 ;
    // 计算偏移量
	$trunc =  strlen($longString) - $maxlength;
	echo substr_replace($longString, $separator, $start, $trunc);
	//prints "abcdefghij...56789z.jpg"
?>

abcdefghijk...456789z.jpg

  
<?php
function truncate($text,$numb) 
{
	$text = html_entity_decode($text, ENT_QUOTES);
	if (strlen($text) > $numb) 
	{
		$text = substr($text, 0, $numb);
		$text = substr($text,0,strrpos($text," "));
    	//This strips the full stop:
    	if ((substr($text, -1)) == ".") 
		{
        	$text = substr($text,0,(strrpos($text,".")));
    	}
		$etc = "..."; 
		$text = $text.$etc;
	} 
	$text = htmlentities($text, ENT_QUOTES); 
	return $text;
}
//Call function
$text = 'welcome to bkjia, welcome to bkjia, welcome to bkjia';
$result = truncate($text, 35);
echo $result;
?>

welcome to bkjia, welcome to...

  
<?php 
	$price = "163000"; 
	$price = substr_replace($price, ',', -3, 0); 
	echo $price;
?>

163,000