php string function (2)

4. Format string function number_format()

<code><span>$str</span> = <span>"123445677"</span>;
<span>$strl</span> = number_format(<span>$str</span>);
<span>$str2</span> = number_format(<span>$str</span>,<span>2</span>);
<span>$str3</span> = number_format(<span>$str</span>,<span>2</span>,<span>","</span>,<span>'.'</span>);
<span>echo</span><span>$str</span>.<span>"<br/>"</span>;
<span>echo</span><span>$strl</span>.<span>"<br/>"</span>;
<span>echo</span><span>$str2</span>.<span>"<br/>"</span>;
<span>echo</span><span>$str3</span>.<span>"<br/>"</span>;</code>

<code> 结果如下所示，number_format(str)表示在千分位上加，隔开。number_format(str,2)表示留两位小数点。number_format($str,2,",",".")把“，”替换成“.”。
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5. Split the string into array function/emplode(). The function implode() that concatenates arrays into strings.

<code><span>$str</span> = <span>"你好@php编程@每天进步一点"</span>;
<span>$tem</span> = explode(<span>'@'</span>,<span>$str</span>);
<span>$teml</span> = explode(<span>'@'</span>,<span>$str</span>,<span>2</span>);
print_r(<span>$tem</span>);
<span>echo</span><span>"<br/>"</span>;
print_r(<span>$teml</span>);</code>

The result is as shown in the figure: explode(ch,str,limit). ch represents the delimiter that splits the string. str represents a string. Limit is optional, indicating how many times to split. The default is all.

<code><span>$array</span> = <span>array</span>(<span>"hello"</span>,<span>"php编程"</span>,<span>"每天进步一点"</span>);
<span>$str</span> = implode(<span>","</span>,<span>$array</span>);
print_r(<span>$str</span>);</code>

<code>   结果如下图 。implode(separator,array)。 separator表示已什么来合成字符串。可选的。默认为空。array表示要合并成字符串的数组
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6. Intercept string /substr(str,separator)

<code><span>$str</span> = <span>"hello,php编程"</span>;
<span>$strm</span> = substr(<span>$str</span>,<span>3</span>);
<span>$strl</span> = substr(<span>$str</span>,-<span>3</span>);
<span>echo</span><span>$strm</span>.<span>"<br/>"</span>;
<span>echo</span><span>$strl</span>;</code>

<code>  substr(str,separator)。str指的是所要截取的字符串。separtor表示从哪里开始截取。正数代表从左开始截取。负数代表从右开始截取。这里3个字符代表一个汉字。（utf-8里是三个字符一个汉字，gb2312里是二个字符一个汉字。）
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The above introduces the PHP string function (2), including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.