如何摆脱'ERROR -'字符串并删除第一个箭头"->"？

Question

我有一个log.php，我想substr一个file_get_contents("applicationlogslog.php");函数，

日志文件包含：

ERROR - 2018-09-17 06:51:03 --> Severity: Warning --> Illegal string offset 'Catatan' /var/www/html/minilos/application/views/minilos/form_akkk.php 483
ERROR - 2018-09-17 06:51:03 --> Severity: Warning --> Illegal string offset 'Catatan' /var/www/html/minilos/application/views/minilos/form_akkk.php 483
ERROR - 2018-09-17 06:51:03 --> Severity: Warning --> Illegal string offset 'Rekomendasi' /var/www/html/minilos/application/views/minilos/form_akkk.php 502
ERROR - 2018-09-17 06:51:03 --> Severity: Warning --> Illegal string offset 'Rekomendasi' /var/www/html/minilos/application/views/minilos/form_akkk.php 502
ERROR - 2018-09-17 06:51:03 --> Severity: Warning --> Illegal string offset 'name' /var/www/html/minilos/application/views/minilos/form_akkk.php 507
ERROR - 2018-09-17 06:51:03 --> Severity: Warning --> Illegal string offset 'name' /var/www/html/minilos/application/views/minilos/form_akkk.php 507

如何摆脱'ERROR -'字符串并删除第一个箭头'->'

2018-09-17 06:51:03 Severity: Warning --> Illegal string offset 'Catatan' /var/www/html/minilos/application/views/minilos/form_akkk.php 483

Answer 1

您可以使用preg_replace来提供最大的灵活性：

$err = "ERROR - 2018-09-17 06:51:03 --> Severity: Warning --> Illegal string offset 'Catatan' /var/www/html/minilos/application/views/minilos/form_akkk.php 483
ERROR - 2018-09-17 06:51:03 --> Severity: Warning --> Illegal string offset 'Catatan' /var/www/html/minilos/application/views/minilos/form_akkk.php 483
ERROR - 2018-09-17 06:51:03 --> Severity: Warning --> Illegal string offset 'Rekomendasi' /var/www/html/minilos/application/views/minilos/form_akkk.php 502
ERROR - 2018-09-17 06:51:03 --> Severity: Warning --> Illegal string offset 'Rekomendasi' /var/www/html/minilos/application/views/minilos/form_akkk.php 502
ERROR - 2018-09-17 06:51:03 --> Severity: Warning --> Illegal string offset 'name' /var/www/html/minilos/application/views/minilos/form_akkk.php 507
ERROR - 2018-09-17 06:51:03 --> Severity: Warning --> Illegal string offset 'name' /var/www/html/minilos/application/views/minilos/form_akkk.php 507";
echo preg_replace(array('/(^|R)ERRORs*-s*/', '/(^|R)(.*?)s*-->s*/'), array('$1', '$1$2 '), $err);

输出：

2018-09-17 06:51:03 Severity: Warning --> Illegal string offset 'Catatan' /var/www/html/minilos/application/views/minilos/form_akkk.php 483
2018-09-17 06:51:03 Severity: Warning --> Illegal string offset 'Catatan' /var/www/html/minilos/application/views/minilos/form_akkk.php 483
2018-09-17 06:51:03 Severity: Warning --> Illegal string offset 'Rekomendasi' /var/www/html/minilos/application/views/minilos/form_akkk.php 502
2018-09-17 06:51:03 Severity: Warning --> Illegal string offset 'Rekomendasi' /var/www/html/minilos/application/views/minilos/form_akkk.php 502
2018-09-17 06:51:03 Severity: Warning --> Illegal string offset 'name' /var/www/html/minilos/application/views/minilos/form_akkk.php 507
2018-09-17 06:51:03 Severity: Warning --> Illegal string offset 'name' /var/www/html/minilos/application/views/minilos/form_akkk.php 507

preg_replace调用有两种要匹配的模式：'/(^|R)ERRORs*-s*/' and '/(^|R)(.*?)s*-->s*/'和'$1' and '$1$2 '是相应的替换字符串。在这些字符串中，表达式$1引用模式中的第一个匹配组(在这两种情况下，(^|R)匹配行首或新行(。在第二个替换中，$2用于输出从行首到第一个-->的所有字符，即第二组(.*?)捕获的字符。