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34 lines
855 B
34 lines
855 B
<?php
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//去除字符串首尾的空白字符（或者其他字符）
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$str=' hello world ';
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var_dump(trim($str));
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echo '<br>';
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//获取字符串长度
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$str='hello world';
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echo $str.' len:'.strlen($str).'<br>';
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//获取中文字符串的长度
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$str='你好世界';
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$len=mb_strlen($str);
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echo $str.' len:'.$len.'<br>';
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//自动转义字符串，常用于数据库
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$sql="select * from talbe1 where 'name'='邝伟键'";
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$str=addslashes($sql);
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echo $str.'<br>'; // select * from talbe1 where \'name\'=\'邝伟键\'
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//还原转义字符
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$str=stripslashes($str);
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echo $str.'<br>'; // select * from talbe1 where 'name'='邝伟键'
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//分割字符串并转为数组
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$str='hello,world,php';
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$arr=explode(',',$str);
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echo '<pre>';
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print_r($arr);
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echo '<br>';
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?>
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