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<?php $s = '123_abc____def'; var_dump( preg_replace( '/\_+[a-zA-Z]{1}/e', '_' . strtoupper('\\1'), $s) );
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Warning: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead in /in/rdcOB on line 6 NULL
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Warning: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead in /in/rdcOB on line 6 NULL
Output for 7.0.19 - 7.0.33, 7.1.5 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
Warning: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead in /in/rdcOB on line 9 NULL
Output for 7.0.0 - 7.0.18, 7.1.0 - 7.1.4
Warning: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead in /in/rdcOB on line 8 NULL
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.38
Deprecated: preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead in /in/rdcOB on line 9 Notice: Use of undefined constant _ - assumed '_' in /in/rdcOB(9) : regexp code on line 1 Notice: Use of undefined constant _ - assumed '_' in /in/rdcOB(9) : regexp code on line 1 string(9) "123_bc_ef"

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